Answer:
11,143.3
Step-by-step explanation:
Density measures the number of people per unit area
Density = population / area
1,579,000 / 141.7 = 11,143.30
Find the area of the figure
Answer:
288.62
Step-by-step explanation:
How much money will there be in an account at the end of 8 years if $9,000 is deposited at 3% interest compounded semi-annually? (Assume no withdrawals are made.)
Answer:
8730
Step-by-step explanation:
Mathematics Grade 5 Sample Items
Tral
Question 26
Line
Guide
Enter a value for b that makes this statement true; 5* b is less than 5 but greater than 0.
?
Answer:
The answer is within the range of 0.1 - 0.9.
Step-by-step explanation:
For example, 0.5 could be the answer.
A polling company conducted a survey asking 40 fourth year students from Ohio and 33 fourth-year students from Pennsylvania about on average, how many hours they spend on the computer per week. Ohio had an average of 52, while Pennsylvania had an average of 33. Ohio and Pennsylvania have standard deviations of 7.22 and 10.11 respectively. Construct a 99.9% confidence interval for the difference between these results.
Answer:
The 99.9% confidence interval for the difference between these results is between 12.09 and 25.91 hours per week.
Step-by-step explanation:
Before building the confidence interval, we need to understand the central limit theorem and subtraction between normal variables.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex]
Subtraction of normal variables:
When two normal variables are subtracted, the mean is the subtraction of the means, while the standard deviation is the square root of the sum of variances.
Ohio had an average of 52, standard deviation of 7.22, sample of 40.
This means that [tex]\mu_O = 52, s_O = \frac{7.22}{\sqrt{40}} = 1.1416[/tex]
Pennsylvania had an average of 33, standard deviation of 10.11, sample of 33.
This means that [tex]\mu_P = 33, s_P = \frac{10.11}{\sqrt{33}} = 1.76[/tex]
Distribution of the difference:
[tex]\mu = \mu_O - \mu_P = 52 - 33 = 19[/tex]
[tex]s = \sqrt{s_O^2 + s_P^2} = \sqrt{1.1416^2 + 1.76^2} = 2.1[/tex]
Confidence interval:
We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:
[tex]\alpha = \frac{1 - 0.999}{2} = 0.0005[/tex]
Now, we have to find z in the Ztable as such z has a pvalue of [tex]1 - \alpha[/tex].
That is z with a pvalue of [tex]1 - 0.0005 = 0.9995[/tex], so Z = 3.29.
Now, find the margin of error M as such
[tex]M = zs[/tex]
[tex]M = 3.29*2.1 = 6.91[/tex]
The lower end of the interval is the sample mean subtracted by M. So it is 19 - 6.91 = 12.09 hours per week
The upper end of the interval is the sample mean added to M. So it is 19 + 6.91 = 25.91 hours per week.
The 99.9% confidence interval for the difference between these results is between 12.09 and 25.91 hours per week.
GIVING 50 POINTS IF YOU ANSWER!!!!
Answer:
MAD would be more similar than mean
Step-by-step explanation:
Without doing any calculations, I assumed that the average value for each neighbor is different since their dot plots surround different areas. The MAD is the mean absolute deviation where it shows how distributed are the dot plots compared to the average value. In this case, I can tell that both neighborhoods having a very similar distribution of dot plots relative to their average/mean. Hope this helps!
Simplify the polynomial, then evaluate for x = 2 . x + 3x ^ 2 + 2x - 3 - 4x ^ 2 + 6
Answer:
-x^2+3x+3
Step-by-step explanation:
if the evaluated answer is correct (but my answer above is correct) it would be -4+6+3 then the answer would be 5 but I am not sure
Find the measures of the interior angles of the triangle.
∠A = 30°
∠B = °
∠C= °
I uploaded the file. Please help this is due in 10 min! I will also give brainiest! PLEASE NO DROP FILES OR I WILL REPORT!
Answer:
∠A = 30°
∠B = 60°
∠C= 90°
Step-by-step explanation:
This is a right triangle, you can see it mainly by the red square in C, and it is always used to mark 90 degrees.
Knowing that, you now know ∠C is 90°
Now, to find ∠B, you should use the following equation:
A+B+C = 180°This means that the sum of the three angles of a triangle gives 180. ALWAYS. So to find the missing angle, ∠B, do the following:
Fill the values of the equation with the angles you now know:
30° + B + 90° = 180Solve the equation, passing the 30° and 90° to the other side of the equal sing with Inverse Operation:
B = 180° - 30° - 90°B = 60
Hope it helps!!
Find the 9th term of the geometric sequence show below
Answer:
40x^20
Step-by-step explanation:
Each sequence the x value doubles.
Each sequence the x exponent goes up by 5
what is the equation of a line that passes through 2,-3 with a slope of 2/3
Answer:
y=2/3x-13/3
Step-by-step explanation:
this is the equation
Consider a situation in which P(A), = 1/8, P(C) = 1/4, and P(A and B) = 1/12. what is P(V and C)
Answer:
1/6
Step-by-step explanation:
just did on edg
Which of the following represents the distance between -8 and 4 on a number line?
Answer:
You would put an open dot on both ends from -8 to 4 or just a distance of 12
Step-by-step explanation:
help please!!!!!!!!!!!!!!!!!!! very important
Answer:
i got B for my answer
what is the mean median mode and range of 98,89,76,93,89?
Answer:
Mean: 89
Median: 89
Mode: 89
Range: 22
Step-by-step explanation:
Answer:
89
Step-by-step explanation:
Mean-89
Median-89
Mode-89
A cube has an A on 3 sides and a B on 3 sides. Rolling it 50 times results in 17 A's and 33 B's.
Using this observed probability, how many A's would be rolled in 750 tries?
Translate the expressions with rational exponents into radical expressions, then simplify.
Please show step by step so I can understand
For each pair of functions F and G below, find f(g(x)) and g(f(x)).
Then, determine whether f and g are inverses of each other.
Simplify your answers as much as possible.
(Assume that your expressions are defined for all x in the domain of the composition.
You do not have to indicate the domain.)
Answer:
FG
Step-by-step explanation:
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The function f(x) = x - 4 and g(x) = x + 4 and the function f(x) = -3/x and g(x) = 3/x are not inverse of each other.
What is a function?The function is an expression, rule, or law that defines the relationship between one variable to another variable. Functions are ubiquitous in mathematics and are essential for formulating physical relationships.
For each pair of functions F and G below, find f(g(x)) and g(f(x)).
a) f(x) = x - 4 and g(x) = x + 4
Then f(g(x)) will be
[tex]\rm f(g(x)) = x[/tex]
Then g(f(x)) will be
[tex]\rm g(f(x)) = x[/tex]
The functions f and g are not inverse of each other.
b) f(x) = -3/x and g(x) = 3/x
Then f(g(x)) will be
[tex]\rm f(g(x)) =- x[/tex]
Then g(f(x)) will be
[tex]\rm g(f(x)) = -x[/tex]
The functions f and g are not inverse of each other.
More about the function link is given below.
https://brainly.com/question/5245372
56 times a number minus 13 is equal to 6 less than the number.
Step 2 of 2: Solve the equation for z. Express your answer as an integer, a reduced fraction, or a decimal number rounded to two places.
Answer:
Z = 19/56OR Z = 0.34Step-by-step explanation:
The steps in the photo above
I hope that is useful for you :)
A ball is thrown vertically upward from the ground. Its distance in feet from the ground in t seconds is s=−16t2+192t. After how many seconds will the ball be 560 feet from the ground?
Answer:
t=7seconds or 5seconds
Step-by-step explanation:
s=-16t^2 +192t
let s=560ft
560=-16t^2 +192t
16t^2 -192t+560=0
16(t^2-12t+35)=0
(t^2 -12t +35)=0
factoring it ,it will give
(t-7)(t-5)=0
solving for t
t-7=0 or t-5=0
t=7s or t=5s
Change to slope-intercept form. Then find the y-intercept, first point, and second point.
x + 3y > 9
slope intercept form
y -Intercept
first point (let x=0)
second point
Answer:
[tex]x + 3y > 9 \\ 3y > - x + 9 \\ y > - \frac{1}{3} x + 3 \\ y - intercept \: is \: 3 \\ first \: point = 3 \\ second \: point \: = 9[/tex]
If I went to the store and purchased a
T-shirt for $10 and jeans for $25, what
was my total expense at the store? Explain
how you got your total.
Two workers can finish building a play set in 18 hours. How long will it take 4 workers to build 3 play sets
Answer:
it will take 4 workers 27 hours to build 3 playsets.
Step-by-step explanation:
Given;
two works to build 1 play set in 18 hours
If a worker works at the same rate, he will finish a playset as follows;
2 worker ---------> 18 hours
1 worker -----------> ?
1 worker = 2 x 18 hours = 36 hours for 1 playset
4 workers will take ³⁶/₄ hours for 1 playset
4 workers --------------> 9 hours for 1 playset
For 3 playsets, 4 workers will take 3 x 9 hours = 27 hours.
Therefore, it will take 4 workers 27 hours to build 3 playsets.
If 19.3% of children and adolescents are obese (14.4M), what is the total number of children and adolescents overall? Please i need help
Answer:
74,611,399
Step-by-step explanation:
Percentage of obese children and adolescent = 19.3%
19.3% = 14.4 million
The overall number of children and adolescent equals a total percentage of 100%
Hence,
If 19.3 % = 14.4 million
100% = x
Cross multiply :
19.3% x = 100% * 14.4 million
0.193x = 14400000
x = 14400000 / 0.193
x = 74611398.964
Total number of children and adolescent = 74,611,399
2(v + 1). Simplify the expression
Answer:
2v+2
Step-by-step explanation:
The sum of two angle measures is supplementary. The measure of the first angle is
123∘.
What is the measure of the second angle?
Select one:
57∘
67∘
47∘
37∘
what is the square root of 377.68
Answer:
19.4339908408
If two figures that are similar have a factor of 1.2, the second figure is:
A quick answer and no link please!
Answer:
enlarged
Step-by-step explanation:
imagine there are two figures, figure A and B. figure A has a length of 10cm and the scale factor is 1.2
the length of figure B = 10 X 1.2 = 12
Figure B has a longer length than figure A. thus figure B is an enlarged version of figure A.
Conversely, if the factor is 0.2
the length of figure B = 10 X 0.2 = 2cm
the length of figure B is less than that of figure A. Thus, figure B is a scaled image of A
Multiply 4x (x - 3)
I need help badly please
Answer:
[tex] {4x}^{2} - 12x[/tex]
Answer:
4x² - 12x
Step-by-step explanation:
Multiply 4x by each term inside the parentheses
4x(x) = 4x²
4x(-3) = -12x
Put the terms back into order
4x² - 12x
1) If you roll two dice, one red and one blue, what is the probability that the red die shows 5 and
the product of both numbers shown is less than 20?
Answer:
3 combinations
Step-by-step explanation:
If
when did the alec meet the stallion ?
Answer:
The Black Stallion, known as the Black or Shêtân, is the title character from author Walter Farley's bestselling series about the Arab stallion and his young owner, Alec Ramsay. The series chronicles the story of a sheikh's prized stallion after he comes into Alec's possession, although later books furnish the Black's backstory. Shaytan (under various transliterations) is the Arabic word for "devil".