What is the equation, in factored form, of the quadratic function shown in the graph?
Graph shows upward parabola on a coordinate plane. Parabola vertex is at (minus 0.5, minus 6.2) in quadrant 3. Left slope intersects X-axis at (minus 3, 0) and enters quadrant 2. Right slope intersects X-axis at (2, 0) and enters quadrant 1.
Answers
The equation of the quadratic function, in factored form, is f(x) = 0.992(x + 3)(x - 2)
To determine the equation of the quadratic function based on the given information, we can use the factored form of a quadratic equation. The factored form of a quadratic function is given as follows:
f(x) = a(x - r1)(x - r2)
where "a" is the leading coefficient, and r1 and r2 are the roots (or x-intercepts) of the quadratic function.
Based on the information provided, we can deduce the following:
The vertex of the parabola is at (-0.5, -6.2). Since the parabola opens upward, the leading coefficient "a" must be positive.
The left slope intersects the x-axis at (-3, 0), which implies that x = -3 is one of the roots (or x-intercepts) of the quadratic function.
The right slope intersects the x-axis at (2, 0), which means x = 2 is the other root (or x-intercept) of the quadratic function.
Using this information, we can now determine the equation of the quadratic function:
Since we have the roots, r1 = -3 and r2 = 2, we can plug these values into the factored form equation:
f(x) = a(x - r1)(x - r2)
f(x) = a(x - (-3))(x - 2)
f(x) = a(x + 3)(x - 2)
To find the value of the leading coefficient "a," we can use the vertex coordinates. Since the vertex is (-0.5, -6.2), we can substitute these values into the equation:
-6.2 = a((-0.5) + 3)((-0.5) - 2)
-6.2 = a(2.5)(-2.5)
-6.2 = a(-6.25)
Dividing both sides by -6.25:
a = -6.2 / -6.25
a ≈ 0.992
Therefore, the equation of the quadratic function, in factored form, is:
f(x) = 0.992(x + 3)(x - 2)
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Note the graph is
Related Questions
A company prepares their shipments in two different-sized boxes.
In order to fit with new shipping regulations, the company needs to decrease the volume of the boxes and will do this by reducing each of the dimensions by at least x inches.
Which system of inequalities can be used to model V, the volume of each box, after each dimension has been reduced by at least x inches?
Answers
Answer:
Answer is A. -296x+960/ -636x+3,024
Step-by-step explanation:
Answer:
HEREEE besties
A just answer pls I gotta write random words bc the question is a pic
Answers
Answer:
$84
Step-by-step explanation:
A new online music service has a collection of 1,500 songs. It expects to triple the number of songs each year for the next few years. Write an equation representing the relationship, where x is time in years, and y is the number of songs available.
Answers
Answer: y = (3^(x-1))*1500
Step-by-step explanation:
We want the relationship
y = f(x)
where y is the number of songs, and x is the number of years.
We know that in the first year, x = 1, the site has 1,500 songs.
The next year, x = 2, the number of songs is tripled, then we will have:
1,500*3 = 4500 songs.
The next year, x = 3, we will have: 3*(3*1500) = (3^2)*1500.
when x = 4, the number is tripled again:
3*(3^2)*1500 = (3^3)*1500
We already can see the pattern, for the year x, the site will have:
y = (3^(x-1))*1500 songs.
This is the equation we are looking for.
$12.60 for 3 boxes. Find the unit rate
Answers
Answer:
$4.20 / box
Step-by-step explanation:
12.60 / 3 = 4.20
5 6 7 8 9 + 10 11 12 13 14 15 16 17 18 data a Based on the boxplot above, identify the 5 number summary The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 44 ounces and a standard deviation of 11 ounces. Use the Standard Deviation Rule, also known as the Empirical Rule. Suggestion: sketch the distribution in order to answer these questions. and a) 68% of the widget weights lie between b) What percentage of the widget weights lie between 11 and 55 ounces? S c) What percentage of the widget weights lie above 22?
Answers
a. The 68% of the widget weights lie between 33 ounces and 55 ounces.
b. The percentage of widget weights lying between 11 and 55 ounces is approximately 68%.
c. The percentage of widget weights lying above 22 ounces is approximately = 5%.
Based on the given data points: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, the five-number summary can be identified as follows:
Minimum: 5
First Quartile (Q1): 7
Median (Q2): 11
Third Quartile (Q3): 15
Maximum: 18
Now, let's answer the questions related to the distribution of widget weights using the Empirical Rule:
a) The Empirical Rule states that for a bell-shaped distribution, approximately 68% of the data lies within one standard deviation of the mean. Since the mean is 44 ounces and the standard deviation is 11 ounces, we can say that approximately 68% of the widget weights lie between 44 - 11 = 33 ounces and 44 + 11 = 55 ounces.
b) To determine the percentage of widget weights lying between 11 and 55 ounces, we need to calculate the z-scores for these values. The z-score is calculated using the formula: z = (x - mean) / standard deviation.
For 11 ounces: z1 = (11 - 44) / 11 = -33/11 = -3
For 55 ounces: z2 = (55 - 44) / 11 = 11/11 = 1
Using the Empirical Rule, we know that approximately 68% of the data lies within one standard deviation of the mean. Therefore, the percentage of widget weights lying between 11 and 55 ounces is approximately 68%.
c) To determine the percentage of widget weights lying above 22 ounces, we need to calculate the z-score for 22 ounces: z = (22 - 44) / 11 = -22/11 = -2.
Using the Empirical Rule, we know that approximately 95% of the data lies within two standard deviations of the mean. Therefore, the percentage of widget weights lying above 22 ounces is approximately 100% - 95% = 5%.
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A circus rents a rectangular building that has floor dimensions of 50 by 100 feet
Answers
Answer:
50 x 100=5,000
Step-by-step explanation:
50 x 100
Pls help it due soon
Answers
Answer:
I need help with math too. Can u help me and I’ll help u
Step-by-step explanation:
100 points brainliest!!! plz answer all to the best of your ability no links they don't work for me
Answer the following questions using what you've learned from this unit. Write your responses in the space provided.
1. Part I: The degree of a polynomial is the (greatest / least) of the degrees of its terms. (Circle the term that correctly completes this definition.) (1 point)
Part II: In order to write a polynomial in descending order, you must write the terms with the exponents (decreasing / increasing) from left to right. (Circle the term that correctly completes this rule.) (1 point)
Part III: For each polynomial, determine the degree and write the polynomial in descending order. (4 points: 2 points each)
A. –4x2 – 12 + 11x4 B. 2x5 + 14 – 3x4 + 7x + 3x3
2. Use addition and subtraction to simplify the following polynomials.
A. Add polynomials: (3 – 4x + 8x2) + (–6 + 2x – 5x2)
Step 1: Rewrite the polynomials without the parentheses. (1 point)
Step 2: Write the polynomial in descending order and use parentheses around like terms. (1 point)
Step 3: Add the like terms identified in Step 2 to simplify the polynomial. (1 point)
B. Subtract polynomials: (3x – 5 – 7x2) – (–2 + 6x2 – 5x)
Step 1: Rewrite the polynomials without the parentheses. Remember to multiply each term in the second parentheses by –1. Show your work. (2 points)
Step 2: Write the polynomial in descending order and use parentheses around like terms. (1 point)
Step 3: Add the like terms identified in Step 2 to simplify the polynomial. (1 point)
3. Use the FOIL method to multiply binomials.
Part I: When multiplying binomials, the FOIL method helps you to organize the multiplication of each term of the first binomial by each term of the second. Fill in each blank with the word used to show how the binomials' terms are multiplied. (2 points: 0.5 point each)
F
O
I
L
Part II: Using the FOIL method, multiply the terms in the binomials below. Show your work in the blanks provided. Then, add any like terms and write the polynomial in standard form in the space provided. Show your work. (8 points: 2 points each)
A. (3x + 7)(2x – 5) B. (x2 + 2x)(5x2 – 3x)
______ + _______ + _______ + _______
______ + _______ + _______ + _______
______________________
______________________
C. (5x + 4)(5x – 4) D. (x2 – 7)(x2 – 4)
______ + _______ + _______ + _______
______ + _______ + _______ + _______
______________________
______________________
4. Use the distributive property to multiply the trinomial by the binomial.
Circle the first term in the trinomial, multiply it by each term in the binomial, and place each result in the blank spaces provided. Repeat this process for the second and third terms of the trinomial until all of the spaces are filled in. Finally, in the space provided beneath the blanks, simplify the expression by combining like terms and arranging the terms from highest to lowest order. Show your work. (4 points)
(3x2 – 2x + 7)(x2 + 2x)
______ + _______ + _______ + _______ + ______ + _______
5. Use the vertical method to multiply two trinomials.
Step 1: Multiply the top trinomial by the last term in the bottom trinomial. Place each result in the blank spaces provided. (2 points)
Step 2: Multiply the top trinomial by the middle term in the bottom trinomial. Place each result in the blank spaces provided. (2 points)
Step 3: Multiply the top trinomial by the first term in the bottom trinomial. Place each result in the blank spaces provided. (2 points)
Step 4: Add the three partial products to find the final answer. Place the result at the bottom. (1 point)
6. Sabrina is making an open box from a piece of cardboard that has a width of 12 inches and a length of 18 inches. She'll form the box by making cuts at the corners and folding up the sides. If she wants the box to have a volume of 224 in3, how long should she make the cuts?
Part I: Each dimension (width, length, and height) of the finished box can be represented by a polynomial expression. If the height is x inches, what is the length in terms of x? (2 points)
Height = x
Width = 12 – 2x
Length =
Part II: The formula for volume is v = l • w • h. Use the polynomial expressions from Part I to write an equation to represent the volume of the box. Simplify on the right side by multiplying the polynomials and writing the answer in descending order. Show your work.
HINT: First multiply the binomials representing length and width. Next, multiply the resulting trinomial by the expression representing height. (3 points)
v =
Part III: The length of each cut at the corners is represented by x. To make a box, x must fall in a certain range of values. For example, x cannot be 15 because that would make the flap longer than the width of the box. Identify one reasonable value of x. Why did you choose that value? (2 points)
Part IV: Use the polynomial equation you wrote in Part II to find the volume of the box for each value of x. Show your work. (5 points)
Answers
Answer:
Part I: The degree of a polynomial is the greatest of the degrees of its terms.
Part II: In order to write a polynomial in descending order, you must write the terms with the exponents decreasing from left to right.
Part III: A. -4x² + 11x - 12, degree = 2,
B. 5x³ + 4x + 14, degree = 3.
Step-by-step explanation:
Part I : Since the degree of a polynomial is the highest power of its monomials ( single term ),
e: degree of is 5.
Thus, in part I, the correct option is 'greatest'
Part II: When we write a polynomial then we write the terms of the polynomial in descending order of their degrees.
Thus, in part II the correct option is 'least'
Part III: A.
∵ -4x² has the highest power in the polynomial.
⇒ Degree = 2,
Also, in the polynomial descending order of degrees,
2 > 1 > 0
⇒ polynomial in descending order,
B.
Combining like terms,
∵ 5x³ has the highest degree,
⇒ Degree = 3,
Also, the order of the degrees in the polynomial is,
3 < 2 < 1 < 0
Thus, the polynomial in descending order,
Answer: I had trouble with this one too.
Step-by-step explanation:
Please help me I really need it this is hard for me
Answers
Answer:
27.6 cm
Step-by-step explanation:
Answer: 44.6
Step-by-step explanation:
It’s not that hard use the formula of the volume of a sphere. And just replace the R with whatever your radius is, if you have a diameter just divide it by 2 to get the radius. Hope this helps
Can someone plz help me with these United rates and explain step by step ?
Answers
Which ordered pair is a solution of the equation?
y+1=3(x-4)y+1=3(x−4)y, plus, 1, equals, 3, left parenthesis, x, minus, 4, right parenthesis
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Only (4,-1)(4,−1)left parenthesis, 4, comma, minus, 1, right parenthesis
(Choice B)
B
Only (5,2)(5,2)left parenthesis, 5, comma, 2, right parenthesis
(Choice C)
C
Both (4,-1)(4,−1)left parenthesis, 4, comma, minus, 1, right parenthesis and (5,2)(5,2)left parenthesis, 5, comma, 2, right parenthesis
(Choice D)
D
Neither
Answers
Both (4, 1) and (5, 2) is the solution to the given equation. Therefore, option C is the correct answer.
The given equation is y+1=3(x-4).
A) The given coordinate point is (4, -1).
Substitute (x, y)=(4, -1) in y+1=3(x-4), we get
-1+1=3(4-4)
0=0
So, (4, -1) is the solution to the given equation.
B) The given coordinate point is (5, 2).
Substitute (x, y)=(5, 2) in y+1=3(x-4), we get
2+1=3(5-4)
3=3
So, (5, 2) is the solution to the given equation.
C) Here, both (4, 1) and (5, 2) is the solution to the given equation.
Therefore, option C is the correct answer.
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For each of these 10 samples, compute Statistics 1, 2, and 3. Enter your answers as 3 numbers separated by commas, such as 1,2,3. 2,3,3* 2,3,4 2, 3, 4* 2, 3+ 4 2, 3*, 4* 2, 4, 4* 3,3*, 4. 3, 3*, 4* 3, 4, 4* I 3*, 4,4* Which statistic would you recommend for estimating ? Average of smallest and largest values in the sample
Answers
Statistic 1 would you recommend for estimating average of smallest and largest values in the sample
To compute Statistics 1, 2, and 3 for the given samples, and determine which statistic would be recommended for estimating the average of the smallest and largest values, let's go through each sample one by one:
1. 2,3,3*
Statistics 1: Sum of the values = 2 + 3 + 3 = 8
Statistics 2: Average of the values = (2 + 3 + 3) / 3 = 2.67
Statistics 3: Median of the values = 3
2. 2,3,4
Statistics 1: Sum of the values = 2 + 3 + 4 = 9
Statistics 2: Average of the values = (2 + 3 + 4) / 3 = 3
Statistics 3: Median of the values = 3
3. 2,3,4*
Statistics 1: Sum of the values = 2 + 3 + 4 = 9
Statistics 2: Average of the values = (2 + 3 + 4) / 3 = 3
Statistics 3: Median of the values = 3
4. 2,3*,4*
Statistics 1: Sum of the values = 2 + 3 + 4 = 9
Statistics 2: Average of the values = (2 + 3 + 4) / 3 = 3
Statistics 3: Median of the values = 3
5. 2,4,4*
Statistics 1: Sum of the values = 2 + 4 + 4 = 10
Statistics 2: Average of the values = (2 + 4 + 4) / 3 = 3.33
Statistics 3: Median of the values = 4
6. 3,3*,4
Statistics 1: Sum of the values = 3 + 3 + 4 = 10
Statistics 2: Average of the values = (3 + 3 + 4) / 3 = 3.33
Statistics 3: Median of the values = 3
7. 3,3*,4*
Statistics 1: Sum of the values = 3 + 3 + 4 = 10
Statistics 2: Average of the values = (3 + 3 + 4) / 3 = 3.33
Statistics 3: Median of the values = 3
8. 3,4,4*
Statistics 1: Sum of the values = 3 + 4 + 4 = 11
Statistics 2: Average of the values = (3 + 4 + 4) / 3 = 3.67
Statistics 3: Median of the values = 4
9. 3*,4,4*
Statistics 1: Sum of the values = 3 + 4 + 4 = 11
Statistics 2: Average of the values = (3 + 4 + 4) / 3 = 3.67
Statistics 3: Median of the values = 4
For estimating the average of the smallest and largest values in the sample, the recommended statistic would be Statistics 1, which is the sum of the values. Taking the average of the smallest and largest values can be obtained by dividing the sum by the number of values, which in this case is 3.
Therefore, the recommended statistic for estimating the average of the smallest and largest values is Statistics 1 (sum of the values).
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Out of her 5 gigabyte data plan, Debbie has used 37%. How much data does she have left?
Answers
jawkfjrnsidbjekwbxk2jw dlf 2kqbdkkebakdnrk8w Fflint
Answer:
740%
Step-by-step explanation:
If incomes increase by 58% and the quantity demanded of tennis balls drops by 87% as a result, what is the income elasticity of demand for tennis balls?
Answers
The income elasticity of demand for tennis balls is -1.5. The negative sign indicates an inverse relationship between income and the quantity demanded of tennis balls, suggesting that tennis balls are an inferior good.
To calculate the income elasticity of demand, we need to use the formula:
Income Elasticity of Demand = Percentage change in quantity demanded / Percentage change in income
Given that incomes increase by 58% and the quantity demanded of tennis balls drops by 87%, we can plug these values into the formula:
Income Elasticity of Demand = (-87%)/58%
Simplifying the calculation:
Income Elasticity of Demand = -1.5
The income elasticity of demand for tennis balls is -1.5. The negative sign indicates an inverse relationship between income and the quantity demanded of tennis balls, suggesting that tennis balls are an inferior good.
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The sale price for a jacket that regularly costs $85.00 is now $68.00. With sales tax, a customer pays $73.44. Which THREE statements are correct for this situation?
Answers
Answer:
The sales tax rate is 8%.
C. The sale price is 20% less than the regular price
Step-by-step explanation:
Here are the options to this question :
A) The sales tax rate is 6%
B) The sales tax rate is 8%.
C. The sale price is 20% less than the regular price
Sales tax rate = (tax paid / discounted selling price) x 100
tax paid = amount customer paid - discounted selling price
$73.44 - $68 = $5.44
($5.44 / $68) x 100 = 8%
The sales tax is 8%
Sales price = (discount / initial price) x 100
discount = $85 - $68 = $17
($17 / 85) x 100 = 20%
Answer:
B.) The Sales Tax Rate is 8%
C.) 85-68/85 = discount rate
E.) The Sale Price is 20% less than the regular price.
Step-by-step explanation:
i did the usatestprep :)
I will give Brainliest
Emily rides her bike with a constant speed of 18 km/h. How long will she take to travel a distance of 18 kilometers?
Answers
Answer:
1 hour
Step-by-step explanation:
Travels 18 km/h
km/h = kilometers per hour
Answer:
1 hour
Step-by-step explanation:
Most quadratic equations have______roots?
Answers
Answer:
equal
Step-by-step explanation:
Most quadratic equations have equal roots.
what is the area of a semicircle that has a radius of 30 feet
Answers
Answer:
A = 1413.72 unit²
Step-by-step explanation:
area of a semicircle formula: A = (πr²)/2
To find the area of a semicircle that has a radius of 30 feet, apply r = 30 to the formula A = (πr²)/2:
A = (π30²)/2
A = 1413.72 unit²
Check if (1,6) is the solution to the system shown below
Answers
Answer:
no
Step-by-step explanation:
To determine if (1, 6) is a solution, substitute x = 1, y = 6 into the left side of both equations and if the value obtained equals the right side then it is a solution.
10(1) - 6 = 10 - 6 = 4 ≠ - 6
- 10(1) + 5(6) = - 10 + 30 = 20 ≠ 30
Then (1, 6 ) is not a solution to the system
The human resource department at a certain company wants to conduct a survey regarding worker benefits. The department has an alphabetical list of all 5705 employees at the company and wants to conduct a systematic sample of size 50.
What is k?
K=
(b) Determine the individuals who will be administered the survey. Randomly select a number from 1 to k. suppose that we randomly select 5.
Starting with the first individual selected, the individuals in the survey will be __ , __, __, __ , __
Answers
a) The value of k for the systematic sample is given as follows: k = 114.
b) The individuals are: 1, 2, 3, 4, 5.
What is systematic sample?In a systematic sample, every kth element of the sample out of a sample of n elements is taken.
In this problem, we have a total of 5705 employees, and want a systematic sample of 50 employees, hence the value of k is obtained as follows:
k = 5705/50 = 114.
(rounding the value down to the nearest integer, we just divide the number of people by the sample size to obtain the value of k).
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PLEASEEEEEEEEEEEEEEE HELPPPPPPPPPPPPPP
Answers
Answer:
The equation is x-18 + 8x = 180 (because they form a linear pair of angles.
Each angle measure:-
x-18 + 8x = 180
x + 8x = 180 + 18 (-18 becomes +18)
9x = 198
x = 198/9
x = 22
Angle 1 = x-18 = 22-18 = 4 degrees
Angle 2 = 8x = 8 * 22 = 176 degrees
Hope it helps :')
Fill in the blank The The hypothesis is a statement that the value of a population parameter is equal to some claimed value
Answers
It is a fundamental concept in statistical inference and scientific research.
The hypothesis is a statement that the value of a population parameter is equal to some claimed value. A hypothesis serves as a proposed explanation or prediction about the population based on existing knowledge or observations. In statistical hypothesis testing, two types of hypotheses are considered: the null hypothesis (H0) and the alternative hypothesis (Ha). The null hypothesis assumes no significant relationship or difference between variables, while the alternative hypothesis suggests the presence of a significant relationship or difference.
Hypothesis testing involves collecting sample data and performing statistical analysis to evaluate the evidence against the null hypothesis. The goal is to determine whether the data provides enough evidence to reject the null hypothesis in favor of the alternative hypothesis. This process allows researchers to make conclusions about the population based on the available evidence.
Hypothesis testing provides a framework for making objective and informed decisions in various fields of study, such as psychology, biology, economics, and more. It enables researchers to validate or challenge theories, investigate causal relationships, and contribute to the advancement of knowledge in their respective disciplines.
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25 points !! Please help me! What’s the volume to this question? Urgent !
Answers
Answer:
381 in^3
Step-by-step explanation:
The volume of the green block is V1 = length(width)(height), or
V1 = (16 in)(7 in)(3 in) = 336 in^3, and
the volume of the red triangular prism is V2 = (1/2)(3 in)(5 in)(6 in) =
V2 = 45 in^3
So the total volume is the sum of these two results: 381 in^3
What is the value of y
when 8y/4y +5 = 5/6?
A: 25/7
B: 5/28
C: 15/8
D: 25/28
Answers
Answer:
D
Step-by-step explanation:
please mark brainliest thanks:)
Mrs. Yellow is an email marketing manager, and she got the following characteristics: 20% open rate, 5% click-through rate, 5% conversion rate, and $1000 average order value. If she was sending the promotion email to a list of 20000 members, her company can achieve (number) of conversions, and $ (number) of revenue." Please write down your answers
Answers
The number of conversions Mrs. Yellow's company can achieve is 10, and the revenue they can earn is $10,000.
Mrs. Yellow is an email marketing manager and her company has the following characteristics:
20% open rate, 5% click-through rate, 5% conversion rate, and $1000 average order value. She is sending the promotion email to a list of 20000 members.
To calculate the number of conversions and revenue, we need to use the following formula:
Revenue = Number of conversions × Average order value
Number of conversions = Total number of emails × Conversion rate
Total number of emails = Total number of opened emails × Click-through rate
Total number of opened emails = Total number of sent emails × Open rate
Total number of sent emails = 20,000
Revenue = Number of conversions × Average order value
Total number of sent emails = 20,000
Total number of opened emails = 20,000 × 20/100 = 4,000
Total number of emails = 4,000 × 5/100 = 200
Number of conversions = 200 × 5/100 = 10
Revenue = 10 × 1,000 = $10,000
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f(x, y) = 2(xo-* yot) _40536 orgs 7.6 Otherwise covariance X 1 J = ?
Answers
Covariance is the measure of the joint variability of two random variables. It measures how much two random variables are linearly related to each other. It is denoted by Cov(X, Y).
f(x, y) = 2(xo-* yot) _40536 orgs 7.6, otherwise, covariance X1j = ?The value of covariance X1j can not be determined from the given equation f(x, y) = 2(xo-* yot) _40536 orgs 7.6. There is no relation mentioned between the variables of x and y in the equation. The equation f(x, y) = 2(xo-* yot) _40536 orgs 7.6 means that the function f(x, y) is the multiplication of the value of x to the value of y and then multiplying it by a constant value. The value of the constant is 2(xo-* yot) _40536 orgs 7.6 but the actual value of x and y is unknown. Therefore, we can not calculate the covariance X1j using the given equation. The covariance X1j needs at least two random variables to determine their interdependence, whereas the given equation is a single-variable function that has no relation between two variables .
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To evaluate the performance of a new diagnostic test, the developer checks it out on 150 subjects with the disease for which the test was designed, and on 250 controls known to be free of the disease. Ninety of the
diseased yield positive tests, as do 30 of the controls.
What is the specificity of this test? (2 decimals)
Answers
The specificity of the diagnostic test is 88%, indicating its ability to accurately identify individuals without the disease as negative.
Specificity is a measure of the test's ability to correctly identify individuals without the disease as negative. To calculate the specificity, we need to consider the number of true negatives (controls who yield negative tests) and the total number of controls.
In this case, the number of controls tested is 250, and out of those, 30 yield positive tests. The number of true negatives can be calculated by subtracting the number of false positives (controls who yield positive tests) from the total number of controls:
Negatives which are true = Total Controls - False Positives
True Negatives = 250 - 30 = 220
The specificity is then calculated as the ratio of true negatives to the total number of controls:
Specificity = True Negatives / Total Controls
Specificity = 220 / 250 ≈ 0.88
Therefore, the specificity of this test is approximately 0.88 or 88%. This means that the test correctly identifies 88% of individuals without the disease as negative.
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the length of an arc of a circle is 1/5 of its circumference. if the area of the circle is346.5cm²,find the angle subtended by the arc at the centre of the angle
Answers
Answer:
72°
Step-by-step explanation:
From the question,
Area of the circle = πr²
A = πr²................. Equation 1
Where r = radius of the circle.
⇒ r = √(A/π)............. Equation 2
Given: A = 346.5 cm², π = 3.14
r = √(346.5/3.14)
r = √(110.35)
r = 10.5 cm.
Therefore,
circumference of the circle = 2πr = 2×3.14×10.5
circumference = 65.94 m
If the length of the arc(s) is 1/5 of its circumference.
Therefore, length of arc (s) = 13.188
⇒ length of arc/circumference = 13.188/65.94 = 1/5
s/2πr = θ/360
Where θ = angle substends at the center of the circle
1/5 = θ/360
θ = 360/5
θ = 72°
7. In multiplying 0.125 x 0.08, Dina knew the rule that says she should multiply 125 x 8 and then move the decimal point 5 places. When she did it on the calculator, she saw it was 0.01. She was confused. How would you help her?
Answers
The correct answer to 0.125 x 0.08 is 0.01. Dina's calculator provided the correct result.
The rule Dina mentioned about multiplying 125 x 8 and then moving the decimal point 5 places is not applicable in this case. When multiplying decimal numbers, we need to consider the number of decimal places in each factor.
Here's the correct approach to multiply 0.125 x 0.08:
Step 1: Ignore the decimal point and multiply the numbers as if they were whole numbers:
0.125 x 0.08 = 125 x 8
Step 2: Count the total number of decimal places in the original numbers:
0.125 has three decimal places
0.08 has two decimal places
Step 3: Add the number of decimal places from the original numbers:
Three decimal places + two decimal places = five decimal places
Step 4: Place the decimal point in the result by counting five places from the right:
125 x 8 = 1000
Adding the decimal point five places from the right gives us the final answer: 0.01000
Therefore, the correct answer to 0.125 x 0.08 is 0.01. Dina's calculator provided the correct result.
Learn more about Decimal here:
https://brainly.com/question/30958821
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how do you determine a function if a relation is a function
Answers
Answer:
Hello! A function is easily identified when an x value does not have more than 1 y value. a y value can have as many x values to infinity, but x can only have one y.
Example...
x y
3 5
4 5
1 2