Answers
Answer:
x = 2, y = - 25
Step-by-step explanation:
(1)
note that 36 = 6² , then
[tex]6^{x}[/tex] = 6²
Since bases on both sides are equal then equate the exponents
x = 2
------------------------------------------
(2)
Using the rule of exponents
[tex](a^m)^{n}[/tex] = [tex]a^{mn}[/tex]
note that 25 = 5² , then
[tex]25^{11+3y}[/tex] = [tex](5^2)^{11+3y}[/tex] = [tex]5^{22+6y}[/tex]
Then
[tex]5^{5y-3}[/tex] = [tex]5^{22+6y}[/tex]
Since bases on both sides are equal then equate the exponents
22 + 6y = 5y - 3 ( subtract 5y from both sides )
22 + y = - 3 ( subtract 22 from both sides )
y = - 25
Related Questions
4.) Select ALL equivalent expressions to 5x – 5.5. a) 5x -55 c) 5(x - 1.1) b) 2x - 3 + 3x - 2.5 ) 5.5(x - 1)
Answers
Answer:
1. (-125 a - 5.75) x + b c (605 x - 550 x^2) + 10.75
2. -125 a x + x (-550 b c x + 605 b c - 5.75) + 10.75
3. 0.25 (-500 a x - 220 b c (10 x - 11) x - 23 x + 43)
Step-by-step explanation:
2. You were 22 inches tall at birth, and 48 inches tall on your 8th birthday.
2a) On average, how many inches did you grow per year? (Hint: in 8 years 2 points
you grow a total of 26 inches) include units!!
Answers
Answer:
3.25
Step-by-step explanation:because you have to divide the years with the inches so in each year i would grow about 3.25 inches
If there are 520 grams of radioactive material with a half life of 12 hours how much of the radioactive material will be left after 72 hours? Is the radioactive decay modeled by a linear function or an exponential function
Answers
Answer:
16.25 grams are left
exponential
Step-by-step explanation:
Half the material will decay every 12-hour period (the other half will remain).
Initial amount (at time t = 0): 520 grams
Time t = 12: 260 grams are left
Time t = 24: 130 grams are left
Time t = 36: 65 grams are left
Time t = 48: 32.5 grams are left
Time t = 72: 16.25 grams are left
Radioactive decay is modeled by an exponential function. The function can't be linear because for them, equal time steps would produce equal reductions in the amount of material.
Find the equation for the following parabola. Focus (3,4) Directrix y 2 A. (x-3)2-2 (y-2.5) B. (x-3)2 = 4(y-3) C. (x-3)2 = (y-4) D. (y-3)2-4 (x-3) Enter
Answers
To find the equation of a parabola given its focus and directrix, we use the standard form of the equation of a parabola which is:
[tex]\frac{(y-k)^2}{4a} = x-h[/tex]
Where (h,k) is the vertex of the parabola, and a is the distance between the vertex and the focus (or between the vertex and directrix, they're equal).
Therefore, the answer is option D, (y-3)²-4(x-3).
Using this formula, let's first find the vertex of the parabola. Since the directrix is a horizontal line, the vertex lies halfway between the focus and directrix on the y-axis. Thus, the vertex is at (3,3).
Since the focus is above the vertex, a is positive, and its value is the distance between the vertex and focus:
a = 4 - 3
= 1
Substituting these values into the standard form of the equation of a parabola gives:
[tex]\frac{(y-3)^2}{4(1)} = x - 3$$[/tex]
[tex]\frac{(y-3)^2}{4} = x - 3$$[/tex]
Multiplying both sides by 4 gives:
y - 3 = 2(x - 3)
y = 2x - 3
Therefore, the answer is option D, (y-3)²-4(x-3).
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a railroad crew can replace 450 meters of rails in 3 days
how many kilometers of rail can they repair in 24 days?
Answers
which tool is not needed to construct a perpendiculer bisecter
Answers
Answer:
a protractor is not needed to constant a perpendicular bisecter
Step-by-step explanation:
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Tucker purchased $4,600 in new equipment for a catering business. He estimates that the value of the equipment is reduced by approximately 40% every two years. Tucker states that the function V(t)=4,600(0.4)2t could be used to represent the value of the equipment, V, in dollars t years after the purchase of the new equipment. Explain whether the function Tucker stated is correct, and, if not, determine the correct function that could be used to find the value of the equipment purchased.
show work
Answers
Answer:
The function stated by Tucker is incorrect.
V(t) = 4600(0.8)^t
Step-by-step explanation:
Given the function :
V(t)=4,600(0.4)2t
The initial value of equipment = 4600
Decay rate = 40% of very 2 years
The value of equipment t years after purchase
The exponential decat function goes thus :
V(t) = Initial value * (1 - decay rate)^t
The Decay rate per year = 40% /2 = 20% = 0.2
V(t) = 4600(1 - 0.2)^t
V(t) = 4600(0.8)^t
find an example of a commutative ring R with 1 in R, and a prime ideal P (of R) with no zero divisors but R is not an integral domain.
Answers
An example of a commutative ring R with 1, a prime ideal P, and no zero divisors but R is not an integral domain is the ring R = Z/6Z, where Z is the set of integers and 6Z is the ideal generated by 6.
The ring R = Z/6Z consists of the residue classes of integers modulo 6. The elements of R are [0], [1], [2], [3], [4], and [5], where [a] denotes the residue class of a modulo 6.
In this ring, addition and multiplication are performed modulo 6. For example, [2] + [3] = [5] and [2] * [3] = [0].
R has a multiplicative identity, which is the residue class [1]. It is commutative since addition and multiplication are performed modulo 6.
The ideal P = 2R consists of the elements [0] and [2]. P is a prime ideal since R/P is an integral domain, which means there are no zero divisors in R/P. However, R itself is not an integral domain because [2] * [3] = [0] in R, showing that zero divisors exist in R.
Therefore, the ring R = Z/6Z, with the prime ideal P = 2R, satisfies the given conditions.
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In Exercises 7-12, complete the square in order to put the equation into standard form. Identify the center and the radius or explain why the equation does not represent a circle.
7. x ^ 2 - 12x + y ^ 2 + 6y = - 9
9. x ^ 2 + y ^ 2 + 14x - 20y - 20 = 0
x ^ 1 - 2x + y ^ 1 + 3/2 * y = - 1
8- 3x ^ 2 - 3y ^ 2 + 27y + 61 = 0
10. x ^ 2 + y ^ 2 - 7x - 3y - 1 = 0
12. 4x ^ 2 - 16x + 4y ^ 2 + 16 = 0
Answers
Here are the solutions to each problem, which include the center and radius for each circle:7. Center: (6, -3); Radius: 6.9. Center: (-7, 10); Radius: 13.11. Center: (1, -2); Radius: 1/2.8. Center: (0, 9); Radius: 3/2.10. Center: (7/2, 3/2); Radius: 5/2.12. Center: (2, 0); Radius: 1.
The solution is given as follows;7. x² - 12x + y² + 6y = - 9.
We start by grouping the x and y terms separately, then completing the square by adding half of the coefficient of the respective variable and squaring the result. x² - 12x + y² + 6y = - 9(x² - 12x + __) + (y² + 6y + __) = - 9 + __ + __
Now, we'll fill in the blanks in the parentheses so that the trinomials are perfect squares: (x² - 12x + 36) + (y² + 6y + 9) = - 9 + 36 + 9.
This simplifies to: (x - 6)² + (y + 3)² = 36.
The center of the circle is (6, −3), and its radius is 6.9. x² + y² + 14x - 20y - 20 = 0.
First, we group the x terms and the y terms separately:x² + 14x + y² - 20y = 20.
Now, we'll complete the square in both x and y. x² + 14x + y² - 20y = 20(x² + 14x + __) + (y² - 20y + __) = 20 + __ + __.
We'll fill in the blanks so that the trinomials are perfect squares.
To find the terms to add, we take half of the coefficient of the variable and square it. (x² + 14x + 49) + (y² - 20y + 100) = 20 + 49 + 100
Simplifying, we get (x + 7)² + (y - 10)² = 169.
The center of the circle is (-7, 10), and its radius is 13.x - 2x + y + 3/2y = -1
We first rearrange the terms. x - 2x + y + 3/2y = -1-x - 1/2y = -1
We then complete the square in x and y as follows. x - 2x + y + 3/2y = -1(x - 1) - (1/2)(y + 2) = -1/2(x - 1)² - 1/4(y + 2)² = 1/2
The center of the circle is (1, -2) and its radius is 1/2.8. - 3x² - 3y² + 27y + 61 = 0
We rearrange and group the terms. - 3x² - 3y² + 27y = -61
We then complete the square. - 3x² - 3(y² - 9y + 81/4) + 27(81/4) = -61 - 3(81/4)(x² + (y - 9/2)² = 405/4
The center of the circle is (0, 9) and its radius is 3/2.10. x² + y² - 7x - 3y - 1 = 0
We rearrange and group the terms. x² - 7x + y² - 3y = 1
We then complete the square. x² - 7x + 49/4 + y² - 3y + 9/4 = 1 + 49/4 + 9/4(x - 7/2)² + (y - 3/2)² = 25/4
The center of the circle is (7/2, 3/2), and its radius is 5/2.12. 4x² - 16x + 4y² + 16 = 0
We rearrange and group the terms. 4x² - 16x + 4y² = -16
We then complete the square. 4(x² - 4x + 4) + 4y² = 0(x - 2)² + y² = 1
The center of the circle is (2, 0), and its radius is 1.
Completing the square is a method used to turn quadratic expressions in standard form into perfect squares. It’s often used to find the center and radius of circles.
Here are the solutions to each problem, which include the center and radius for each circle:7. Center: (6, -3); Radius: 6.9. Center: (-7, 10); Radius: 13.11. Center: (1, -2); Radius: 1/2.8. Center: (0, 9); Radius: 3/2.10. Center: (7/2, 3/2); Radius: 5/2.12. Center: (2, 0); Radius: 1.
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Charles and Lisa were having a apple eating contest. They ate eighteen apples between the two of them. Lisa ate two more apples than Charles. How many apples did Lisa eat?
Answers
Answer: She ate 12 apples
Step-by-step explanation: 18 divided by 2 is 9 add 2 of 9 to the other 9 and you get 12 hope I helped
Answer:
she ate 10 apples
Step-by-step explanation:
I thought of it because there is only 18 apples all together
a new shopping mall records 150150150 total shoppers on their first day of business. each day after that, the number of shoppers is 15\, percent more than the number of shoppers the day before.
Answers
The number of shoppers on the first day is 150, and each subsequent day the number of shoppers increases by 15%.
Number of shoppers on the first day: The shopping mall recorded a total of 150 shoppers on their first day of business.
Increase in shoppers each day: Starting from the second day, the number of shoppers increases by 15% compared to the previous day.
To calculate the number of shoppers on each day, we can use the following steps:
Day 1: The number of shoppers on the first day is given as 150.
Day 2: To find the number of shoppers on the second day, we need to increase the number of shoppers from the previous day by 15%.
Number of shoppers on Day 2 = Number of shoppers on Day 1 + (15/100) * Number of shoppers on Day 1
Day 3: Similarly, to find the number of shoppers on the third day, we increase the number of shoppers from the second day by 15%.
Number of shoppers on Day 3 = Number of shoppers on Day 2 + (15/100) * Number of shoppers on Day 2
We can continue this process for each subsequent day, using the number of shoppers from the previous day to calculate the number of shoppers for the current day.
By following these steps, we can determine the number of shoppers on each day, starting from the first day and increasing by 15% each day compared to the previous day.
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g a tank contains 90 kg of salt and 1000 l of water. a solution of a concentration 0.045 kg of salt per liter enters a tank at the rate 8 l/min. the solution is mixed and drains from the tank at the same rate what is the concentration of our solution in the tank initially?
Answers
The final concentration in the tank is 0.045 kg/L, which is the same as the concentration of the incoming solution.
To solve the problem, we can use the formula:
C1V1 + C2V2 = C3V3
where C1 is the initial concentration, V1 is the initial volume, C2 is the concentration of the incoming solution, V2 is the volume of the incoming solution, C3 is the final concentration, and V3 is the final volume.
We know that the initial volume of the tank is 1000 L and it contains 90 kg of salt. To find the initial concentration, we need to convert the mass of salt to concentration by dividing it by the total volume:
90 kg / 1000 L = 0.09 kg/L
This means that initially, the concentration of salt in the tank is 0.09 kg/L.
Next, we need to calculate how much salt enters and leaves the tank during a given time period. Since the incoming solution has a concentration of 0.045 kg/L and enters at a rate of 8 L/min, it brings in:
0.045 kg/L x 8 L/min = 0.36 kg/min
The outgoing solution has the same concentration as the final concentration in the tank, so we can use this formula to find it:
C1V1 + C2V2 = C3V3
(0.09 kg/L)(1000 L) + (0.045 kg/L)(8 L/min)(t min) = C3(1000 L + 8 L/min)(t min)
Simplifying and solving for C3, we get:
C3 = (0.09 kg/L)(1000 L) + (0.045 kg/L)(8 L/min)(t min) / (1000 L + 8 L/min)(t min)
At steady state, when the amount of salt entering and leaving the tank is equal, we can set the incoming and outgoing terms equal to each other:
0.36 kg/min = C3(8 L/min)
Solving for C3, we get:
C3 = 0.045 kg/L
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The value of the Australian dolar (A$) today is $0.73. Yesterday, the value of the Australia dollar was $0.69.
The Australian dollar _______ by ______ %.
a.
appreciated; 5.80
b.
appreciated; 5.48
c.
depreciated; 5.80
d.
depreciated; 4.00
Answers
This indicates that the Australian dollar appreciated by 5.80%. the correct answer is (a) appreciated; 5.80.
To determine whether the Australian dollar appreciated or depreciated and by what percentage, we can calculate the percentage change in value between today and yesterday.
The formula for calculating the percentage change is:
Percentage Change = (New Value - Old Value) / Old Value * 100
Using this formula, we can calculate the percentage change:
Percentage Change = (0.73 - 0.69) / 0.69 * 100
Percentage Change = 0.04 / 0.69 * 100
Percentage Change ≈ 5.80
The percentage change is approximately 5.80%. This indicates that the Australian dollar appreciated by 5.80%.
Therefore, the correct answer is (a) appreciated; 5.80.
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Evaluate 4 + (m - n)
When m = 7 and n = 5.
Answers
4+(7-5)
2. simplify:
4+2
3. evaluate:
6
the answer is 6.
a cone has a height of 7ft and a radius 4ft. Which equation can find the volume of the cone?
PLEASE I ACTUALLY NEED HELP
Answers
Answer:
B
Step-by-step explanation:
equation for volume of a cone = [tex]V=\frac{1}{3}\pi r^2h[/tex]
plug in - [tex]V=\frac{1}{3} \pi (4)^2(7)[/tex]
Answer:
we have
volume of cone =1/3 πr²h=1/3×π×4²×7ft³
so
v=1/3 π(4²)(7)ft³
evan has 4 chocolate bars with a total of 48 pices are in each bar
Answers
Answer:
what is your question? it seems the answer would be 12 just by looking at this, but still what is the question exactly?
Step-by-step explanation:
Answer: if you are dividing the answer will be 12
(i wrote two since it dosent say what we need to do
if you are multiplying you answer will be 192
hope it helped!
Step-by-step explanation:
Consider the following algorithm that takes inputs a parameter 0
function integer X(p,n)% define a function X = integer, depending on p and n
X:=0 for i=1 to n { if RND <= p then X := X+1 % increment X by 1; write X++ if you prefer }
Then X symulates a random variable with what distribution?
Bernoulli of parameter p.
Bernoulli of parameter 1-p.
Binomial of parameters p and n.
Binomial of parameters 1-p and n.
Geometric of parameter p.
None of the other answers are correct.
Answers
The algorithm described simulates a random variable with a binomial distribution of parameters p and n.
The given algorithm involves generating random numbers and incrementing a variable X based on certain conditions. The variable X represents the number of successes or "1" outcomes in a sequence of n independent Bernoulli trials, where each trial has a probability of success equal to p.
In each iteration of the loop, the algorithm generates a random number between 0 and 1 (denoted as RND) and compares it to the probability parameter p. If the generated random number is less than or equal to p, the variable X is incremented by 1.
This process is repeated for a total of n trials, resulting in the count of successes, which follows a binomial distribution. The binomial distribution represents the number of successes in a fixed number of independent Bernoulli trials, where each trial has the same probability of success, given by parameter p. Therefore, the algorithm simulates a random variable with a binomial distribution of parameters p and n.
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Question in pic plz help! ~
Answers
Im gonna label the long side of a rectangle a and the smaller side b.
For the perimeter, 2a + 2b = 34
For the area, a x b = 66
if a is 11 and b is 6, the equation for perimeter would be 22 + 12 = 34.
So a = 11 and b = 6
Answer:
Longer side = 11
Shorter side = 6
Step-by-step explanation:
L x W = 66, then W = 66/L
2L + 2W = 34
substitute for W:
2L + 2(66/L) = 34
2L + 132/L = 34
multiply both sides of the equation by L:
2L² + 132 = 34L
divide both sides by 2:
L² + 66 = 17L
L² - 17L + 66 = 0
factor:
(L - 11)(L - 6) = 0
L = 11 or L = 6
if L = 11, then W = 6
if L = 6 then W = 11
Each side of a square is increased 3 inches. When this happens, the area is multiplied by 25. How many inches in the side of the original square?
Answers
Answer:
s = 0.75 inches
Step-by-step explanation:
Let s = side length of the original square
s + 3 = side length of the new square
Area of a square = s²
A = s²
A = (s+3)²
A = s² + 6s + 9
Area multiplied by 25 = 25 * s²
So,
s² + 6s + 9 = 25s²
25s² - s² - 6s - 9 = 0
24s² - 6s - 9 = 0
8s² - 2s - 3 = 0
a = 8
b = -2
c = -3
s = -b ± √b² - 4ac / 2a
= -(-2) ± √(-2)² - 4(8)(-3) / 2(8)
= 2 ± √4 - (-96) / 16
= 2 ± √100 / 16
= 2 ± 10/16
s = 2 + 10/16 or 2-10/16
= 12/16 or -8/16
= 0.75 or -0.5
side length can not be negative
Therefore, s = 0.75
A = s²
A = (0.75)²
= 0.5625
A = (s+3)²
= (0.75+3)²
= 3.75²
= 13.95
A boy who is on the second floor of their house watches his dog lying on the ground. The angle between his eye level and his line of sight is 32º. a. Which angle is identified in the problem, angle of elevation or depression? b. If the boy is 3 meters above the ground, approximately how far is the dog from the house? c. If the dog is 7 meters from the house, how high is the boy above the ground?
Answers
As per the given details, the dog is approximately 0.6249 * 3 = 1.8747 meters from the house.
The angle recognized in the problem is the angle of depression. The angle of depression is the attitude between the horizontal line and the line of sight from an observer looking downward.
To calculate approximately how a ways the canine is from the residence, we are able to use trigonometry.
Since the angle of despair is given as 32º and the boy is 3 meters above the floor, we will use the tangent characteristic to find the space.
tan(32º) = (dog's distance / boy's height)
tan(32º) = d / 3
3 * tan(32º) = d
The dog is approximately 0.6249 * 3 = 1.8747 meters from the house.
To calculate how high the boy is above the floor, we are able to again use trigonometry. Since the canine is 7 meters from the residence and the attitude of melancholy is given as 32º, we are able to use the tangent characteristic to discover the peak of the boy.
tan(32º) = (boy's height / dog's distance)
tan(32º) = h / 7
7 * tan(32º) = h
Therefore, the boy is approximately 0.6249 * 7 = 4.3743 meters above the ground.
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Jamal has a new business as a financial consultant. He uses the formula y = 1,500x + 500 as a starting point for new customers. Y is the total amount of money and x is the number of years of investments. What is the total amount of money a dient would have after 7 years?
Answers
Answer:
11,000
Step-by-step explanation:
You would multiply 1,500 by 7 and then add 500.
I=7 m, w=4 m, h= 3 m
Answers
The volume of the room with the given dimensions is 84 cubic meters.
The volume of a room can be calculated by multiplying its length, width, and height. In this case, the given dimensions are:
Length (L) = 7 m
Width (W) = 4 m
Height (H) = 3 m
To find the volume, we can use the formula:
Volume = Length × Width × Height
Substituting the given values:
Volume = 7 m × 4 m × 3 m
Simplifying:
Volume = 84 m³
Therefore, the volume of the room with the given dimensions is 84 cubic meters.
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Sketch two periods of the graph of the function h(x)=4sec(π4(x+3)). Identify the stretching factor, period, and asymptotes.
Enter the exact answers.
Stretching factor = ____________
Period: P=
__________
Enter the asymptotes of the function on the domain [−P,P].
To enter π, type Pi.
The field below accepts a list of numbers or formulas separated by semicolons (e.g. 2;4;6 or x+1;x−1). The order of the list does not matter.
Asymptotes: x=
__________
Select the correct graph of h(x)=4sec(π4(x+3)).
(a) (b) (c) (d)
Answers
The function h(x) = 4sec(π/4(x+3)) represents a graph with a stretching factor of 4 and a period of 8π/4 = 2π. The correct graph representation of h(x) = 4sec(π/4(x+3)) needs to show these characteristics. The correct answer would be (b).
The function h(x) = 4sec(π/4(x+3)) has a stretching factor of 4, which means that the amplitude of the function is multiplied by 4, causing the graph to be vertically stretched.
The period of the function is given by P = 2π/π/4 = 8π/4 = 2π. This means that the graph will complete two periods within the interval [-P, P], which in this case is [-2π, 2π].
The asymptotes of the function occur at x = -P/2 and x = P/2. Substituting the value of P = 2π, the asymptotes are x = -π and x = π. These vertical asymptotes indicate where the graph approaches infinity or negative infinity as x approaches these values.
To determine the correct graph representation of h(x) = 4sec(π/4(x+3)), you would need to choose the graph option that shows the stretching factor of 4, a period of 2π, and vertical asymptotes at x = -π and x = π.
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Use the standard normal distribution or the disebution to constructa confidence interval for the popolnoma Antly you decided why the In a random sample of 45 people, the mean body mass index (BMI) 27 B and the standard devion was 616 Which distribution should be used to contact the condence interval? Choose the correct below O A Use a normal distributor because the sample is rondom the population and on OB. Use anomal distribution because the same is random na 30 known OC Uldistribution because the sales and the population is not an unknown OD Use adidinotion because the sample random and unknown OE. Neither a normal dishon nordisbution can be because the samples and and the now to becoma
Answers
A confidence interval for the population mean (BMI) based on a
random
sample of 45 people, a normal distribution should be used because the sample is random and the population is known.
In this scenario, the sample size is sufficiently large (n = 45), and the population standard
deviation
(σ = 6.16) is known. When these conditions are met, the appropriate distribution to construct a confidence interval for the population mean is the normal distribution. The central limit theorem states that when the sample size is large, the distribution of the sample mean approaches a
normal
distribution regardless of the shape of the population distribution.
Using the normal distribution, we can calculate the
standard
error of the mean (SEM) by dividing the population standard deviation by the square root of the sample size: SEM = σ / √n. In this case, the SEM would be 6.16 / √45. The confidence
interval
can then be calculated by multiplying the SEM by the appropriate critical value for the desired level of confidence (e.g., 95%) and adding/subtracting it to/from the sample mean.
Therefore, to construct a confidence interval for the population mean BMI, we would use a normal
distribution
because the sample is random, and the population standard deviation is known.
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explain how to graph the circle by hand on the coordinate plane (3 points)
Answers
First find the center, then graph all the points that are at a distance of R units from that center.
How to graph a circle by hand?A circle of radius R is the set of all points that are at a distance R from a given point (the center of the circle).
So to graph it, we need to know these two things, radius and center.
Once we do, first we graph the center on the coordinate plane.
Once we find the center, we can find all the poiints that are at a distance of R units from our center, so we need to graph these. Once we do, we will have the graph of our circle on the coordinate plane.
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ILL MARK BRAINLIESTTTTT
Answers
Answer:
0.075 inches per year
Step-by-step explanation:
The average rate of change is measured as
( difference in diameter ) ÷ ( difference in years )
= ( 251 - 248 ) ÷ ( 2005 - 1965 )
= 3 inches ÷ 40 years
= 0.075 inches per year
Which of the following points is not an ordered pair for the function
ƒ(x ) =5/2 x + 6?
(4, 16)
(2, 7)
(-2, 1)
Answers
Answer:
(2, 7) is not an ordered pair for the function.
Step-by-step explanation:
A random sample of 50 home theater systems has a mean price of $115. Assume the population standard deviation is $19.50. Construct a 90% confidence interval for the population mean.
Answers
Based on a random sample of 50 home theater systems, the 90% confidence interval for the population mean price is approximately $110.81 to $119.19, assuming a population standard deviation of $19.50.
To construct a 90% confidence interval for the population mean of home theater systems, we can use the following formula
Confidence Interval = Sample Mean ± Margin of Error
The margin of error depends on the level of confidence and the standard deviation of the population. Given that the sample size is large (n = 50) and we know the population standard deviation is $19.50, we can use the z-distribution.
First, we need to find the critical value (z) for a 90% confidence level. Using a standard normal distribution table or calculator, the critical value for a 90% confidence level is approximately 1.645.
Next, we calculate the margin of error (E) using the formula:
Margin of Error (E) = z * (Population Standard Deviation / sqrt(n))
E = 1.645 * ($19.50 / √(50))
E ≈ $4.19
Now we can construct the confidence interval:
Confidence Interval = Sample Mean ± Margin of Error
Confidence Interval = $115 ± $4.19
Confidence Interval ≈ ($110.81, $119.19)
Therefore, we can say with 90% confidence that the population mean of home theater systems is between approximately $110.81 and $119.19.
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1. 2
given that c = 2πr an, write an expression
for r.
Answers
Answer:
r = c / 2π
Step-by-step explanation:
c = 2πr is the formula for the circumference of a circle of radius r.
We can solve this for r:
r = c / (2pi)
or
r = c / 2π
What is the answer with explanation?
Answers
The value of arc ABD is determined as 236⁰.
Option C.
What is the measure of arc ABD?The value of arc ABD is calculated by applying intersecting chord theorem, which states that the angle at tangent is half of the arc angle of the two intersecting chords.
Also this theory states that arc angles of intersecting secants at the center of the circle is equal to the angle formed at the center of the circle by the two intersecting chords.
arc BA = 2 x 48⁰ (interior angles of intersecting secants)
arc BA = 96⁰
arc BD = 2 x 70⁰ (interior angles of intersecting secants)
arc BD = 140⁰
arc ABD = arc BA + arc BD
arc ABD = 96⁰ + 140⁰
arc ABD = 236⁰
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