12/14 reduces to 6/7 is what is completed 1/7 is left
What is the area of the shaded region?
Answer:
17,680 ft²
Step-by-step explanation:
Shaded area = entire shaded rectangle area - unshaded rectangle area - square area
A = 200(100) - 24(30) - 40²
A = 20,000 - 720 - 1600 = 17,680
Phil mows lawns during the summer to earn money for college. He makes $50 per mowed lawn. How many lawns must Phil mow to make at least $1,000? Question 18 options: A) At most 20 lawns B) At least 20 lawns C) At most10 lawns D) At least 10 lawns
Answer:
20 lawns
Step-by-step explanation:
$1000 divided by $50 = 20
A six-week fitness program was designed to decrease the time it takes retired individuals to walk one mile. At the beginning of the program, 20 randomly selected retired individuals were invited to participate, and their times to walk a mile were recorded. After the six-week program, their times to walk a mile were again recorded. Most participants saw little to no improvement in their times to walk one mile; however, a few participants saw drastic improvements in their times to walk one mile. The program director would like to perform a hypothesis test to determine if the program reduces the mean time for retired individuals to walk a mile. Which of the following statements is true?
a. Because there are 40 observations in total, the sample size is large enough to assume that the sampling distribution of the sample mean differences is approximately normal.
b. Because the walk times before and after the program are paired, a hypothesis test is not appropriate.
c. The sampling distribution of sample means can be assumed to be approximately normal because the distribution of the sample data is not skewed.
d. Because the sample size of 20 is less than 30 and the improvements in walk times in the sample data appear to be skewed, the distribution of sample means should not be assumed to be approximately normal.
e. Because the program recruited only retired individuals, the distribution of sample means should not be assumed to be approximately normal.
Answer:
c. The sampling distribution of the sample means can be assumed to be approximately normal because the distribution of the sample data is not skewed
Step-by-step explanation:
From the given data, we have;
The category of the sample = Retired individuals
The number of participants in the sample = 20
The duration of program = six-weeks
The improvement seen by most participants = Little to no improvement
The improvement seen by few participants = Drastic improvement
Therefore, given that the participants are randomly selected and the majority of the participants make the same observation of improvement in the time to walk a mile, we have that, the majority of the outcomes show little difference in walk times after the program, therefore, the distribution of the sample data is not skewed and can be assumed to be approximately normal
Which of the following is not a valid triangle congruence theorem?
Find the value of x and the measure of the missing angle labeled A:
Answer:
below with explaination
Step-by-step explanation:
angle A + angle B + angle C = 180
x+x+37+x+67=180
3x+104=180
3x=180-104
3x=76
x=76÷3
x=25.3
angle A = 62.3
Answer:
104 and 90
Step-by-step explanation:
How should the decimal point in 52.48 be moved to determine the product 52.48×105 ?
Answer:
2 to the right i belive
please hepl with this math
Answer:
3,10,17,24
Step-by-step explanation:
An Arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant.
3,10,17,24
the difference is 7
I NEED HELP ON A TEST HELP QUICK
There are white blue and red boats at the marina. Two-thirds of the boats in the marina are white, 4/7 of the remaining ...
IS THIS CORRECT ???????
Answer:
yes
Step-by-step explanation:
Answer:Yep
Step-by-step explanation:
Can you please help me with this question:)
Answer:
D
Step-by-step explanation:
Answer:
letter d
Step-by-step explanation:
a loss is negative do a loss of 18 would be -18
For this cylinder the radius r = 6.8 inches and the height L - 14.2 inches. Which is the BEST estimate for the volume? (Use TI = 3.14)
Answer:303.19
Step-by-step explanation: HOPE I HELPED
I need help with this !!!
Answer:
no it cannot be
Step-by-step explanation:
because :
2/10 equals to 10/2 So 6/10 ÷ 2/10 =6/10×10/2
6×10=60
10×2=20 after reducing the fraction its 3/1
Q. You're working in the sedan section of
Dean's Car Dealership. A customer makes a
down payment of 15% on a new car that costs
$13,450. How much is the down payment?
A. $201.75
B. $2,017.50
C. $269.00
D. $2,690.00
Answer:
B
Step-by-step explanation:
[tex]15%of$13,450=$2,017.50[/tex]%[tex]of13,450=2,017.50[/tex] therefore the down payment is $2,017.50
PLS HELP HELP ME WITH a question pls
Step-by-step explanation:
d.
e +e+25=180°{sum of angle of triangle}
2e+25=180°
2e=155
e=155/2
e=77.5°
e.
55°+55°+f=180°{sum of angle of triangle}
f=180-110
f=70°
hope it helps.
Find the area of the rectangle, the side lengths are (z+9)(3z+8).
What is the correct step to solve this equation?
m + 4 = 10
A. Subtract 4 from both sides
B. Subtract 10 from both sides
C. Add 4 to both sides
D. Add 10 to both sides
A rectangular prism has a volume of 240cm. It's height measures 8 cm. What is the area of its base
Answer: Base = 90 [tex]cm^{2}[/tex]
Step-by-step explanation:
Help ASAP 45 points
Answer:
fd
Step-by-step explanation:
PLSSS HELP DUE IN 5 MINUTES!!!!
PLEASE DO NOT ANSWER JUST FOR POINTS!!!
LOOK AT THE IMAGE FOR THE QUESTIONS AND ANSWERS
NOTE: The first answer “(0,9)” is incorrect I tried and it was wrong so please it’s either (9,0) or (3,0)
Answer:
I think it's (0,3) sorry if it not
Answer:
(3, 0)
Step-by-step explanation:
The vertex point is 3 units to the right of the origin, making the x-coordinate 3, but it doesn’t move up or down, meaning that the y-coordinate is 0.
so it’s (3,0)
Btw, the vertex is the point of the parabola where it’s the minimum or maximu (minimum in this case). You answered for the y-interceptm which is where the parabola touches the y-axis.
What is the equation that represents the relationship shown in the table?
pls answer i beg who answers correct get 100 points
Answer:
y=7p+5e
Step-by-step explanation:
I guess, if that is what you are asking
Answer:
If there 3 slices and 4 slices I would say about near 460 calories or higher
Step-by-step explanation:
In a recent study of 35 ninth-grade students, the mean number of hours per week that they played video games was 16.6. The standard deviation of the population was 2.8.
a. Find the best point of estimate of the population mean
b. Find the 95% confidence level of the mean of the time playing video games
c. Find the 99% confidence interval of the mean time playing video games
d. Which is larger? Explain why.
Answer:
a) 16.6
b) The 95% confidence level of the mean of the time playing video games is between 15.7 and 17.5 hours.
c) The 99% confidence level of the mean of the time playing video games is between 15.4 and 17.8 hours.
d) The margin of error increases as the confidence level increases, due to the value of z, which means that the 99% confidence interval is larger.
Step-by-step explanation:
a. Find the best point of estimate of the population mean
The best estimate for the population mean is the sample mean, which is 16.6
b. Find the 95% confidence level of the mean of the time playing video games
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 - 0.95}{2} = 0.025[/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 - 0.025 = 0.975[/tex], so Z = 1.96.
Now, find the margin of error M as such
[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]
In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.
[tex]M = 1.96\frac{2.8}{\sqrt{35}} = 0.9[/tex]
The lower end of the interval is the sample mean subtracted by M. So it is 16.6 - 0.9 = 15.7 hours
The upper end of the interval is the sample mean added to M. So it is 16.6 - 0.9 = 17.5 hours
The 95% confidence level of the mean of the time playing video games is between 15.7 and 17.5 hours.
c. Find the 99% confidence interval of the mean time playing video games
Following the same logic as above, we have that [tex]Z = 2.575[/tex]. So
[tex]M = 2.575\frac{2.8}{\sqrt{35}} = 0.9[/tex]
The lower end of the interval is the sample mean subtracted by M. So it is 16.6 - 1.2 = 15.4 hours.
The upper end of the interval is the sample mean added to M. So it is 16.6 + 1.2 = 17.8 hours.
The 99% confidence level of the mean of the time playing video games is between 15.4 and 17.8 hours.
d. Which is larger? Explain why.
The margin of error increases as the confidence level increases, due to the value of z, which means that the 99% confidence interval is larger.
The mean is 16.6, 95% confidence interval is between 15.68 to 17.52, the 99% confidence interval is between 15.39 to 17.81, and the 99% confidence interval is larger.
It is given that the in recent study of 35 ninth-grade students the mean number of hours per week is 16.6 with standard deviation of the population was 2.8.
It is required to find the best point of estimate of the population mean, 95% confidence interval, and 99% confidence interval.
What is a confidence interval for population standard deviation?It is defined as the sampling distribution following an approximately normal distribution for known standard deviation.
We have confidence level = 95% = 0.95
We know:
[tex]\alpha = \frac{1-0.95}{2}[/tex] = 0.025
[tex]\rm Z_1 _-_\alpha = Z_{0.975} = 1.96[/tex] (from the Z table)
The sample size n = 35
We know the Margin of error formula:
[tex]\rm M =Z\frac{\sigma}{\sqrt[]{n} }[/tex] ( [tex]\rm \sigma\\[/tex] = 2.8 )
[tex]\rm M =1.96\frac{2.8}{\sqrt[]{35} }[/tex]
M = 0.92
The 95% interval will be:
= X - M ⇒ 16.6 - 0.92 ⇒15.68
= X+ M ⇒ 16.6+0.92 ⇒ 17.52
For 99% confidence level:
[tex]\alpha = \frac{1-0.90}{2} = 0.005[/tex]
[tex]\rm Z_1 _-_\alpha = Z_{0.005} = 2.575[/tex] (from Z table)
[tex]\rm M =2.575\frac{2.8}{\sqrt[]{35} }[/tex]
M = 1.21
The 99% interval will be:
=16.6 - 1.21 ⇒ 15.39
= 16.6+ 1.21 = 17.81
As the value of M increases the confidence value increases due to the value of Z that means 99% confidence interval is larger.
Thus, the mean is 16.6, 95% confidence interval is between 15.68 to 17.52, the 99% confidence interval is between 15.39 to 17.81, and the 99% confidence interval is larger.
Learn more about the confidence interval here:
brainly.com/question/6654139
5 - 3(7n + 8) =??????????
Answer:
-21x-19
Step-by-step explanation:
Answer:
The answer is -19 - 21n
by the way in the image those are the letter N, I hope this helps you :)
Calculator
Enter the unknown value that makes this statement true:
25% of O
is 30.
->
-
1
2
3
Answer:
X = 120
Step-by-step explanation:
here's your solution
=> we need to find the number whose 25%
is 30
=>. now , let the number be X
=> solve for X
=>. 25/100*X = 30
=> X = 30*100/25
=> X = 120
hope it helps
Find the value of ln(-0.379).
Answer:
Undefined
Step-by-step explanation:
To obtain the In(-0.375)
In x = log e x = y
The In is the natural logarithm of a number
To obtain the natural logarithm value of a given number using a calculator :
Simply press the In button followed by the value to obtain the direct value of the number x.
The In of any negative value gives an error output.
The In of x is only defined for values of x greater Than 0; that is ; X > 0
In of negative numbers is undefined
find the probability that a randomly selected point within the circle falls in the red shaded area round to the nearest hundredth r = 4 cm 2.5 cm 3 cm 3 cm
Answer:
[tex]p\approx 0.39[/tex]
Step-by-step explanation:
We are given a circle of radius 4 cm, and a triangle inscribed within the circle with a vertical height of 6.5 cm and a base of 6 cm.
To find the probability a randomly selected point lands in the red area, we can divide the red area by the total area.
The area for a circle is given by:
[tex]A=\pi r^2[/tex]
Since the radius is 4 cm, the area of the circle or total area is:
[tex]A=\pi (4)^2=16\pi \text{ cm}^2[/tex]
The area for a triangle is given by:
[tex]\displaystyle A=\frac{1}{2}bh[/tex]
The base of the triangle is 6 cm total and the vertical height is 6.5 cm. Therefore, the area is:
[tex]\displaystyle A=\frac{1}{2}(6)(6.5)=19.5\text{ cm}^2[/tex]
The probability of landing in the red shaded area is:
[tex]\displaystyle p=\frac{\text{Red Region}}{\text{Total Region}}[/tex]
Therefore:
[tex]\displaystyle p=\frac{19.5}{16\pi}\approx 0.39=39\%[/tex]
5th grade math. correct answer will be marked brainliest.
Answer:
1, 2, 4, 11, 22, 44.
Step-by-step explanation:
Hope this helps :)
hey guys i need some help on this division problem i have
Answer:
3. 25/28
4. 1 1/7
Step-by-step explanation:
when you divide fractions just flip one of them and then multiply across
so instead of 5/7 ÷ 4/5 its
5/7 • 5/4
please mark me brainliest to help me get ace rank
.
Write the expression in exponential form, and then evaluate
0.75x 0.75x 0.75
=
Answer:
3
.75
the solved version would be .421875
the numbers on top are translated in English to .75 to the power of 3.
Step-by-step explanation:
I'm pretty sure this is correct
PLS HELP
Simply the expression by combining like terms.
6x+9+2x+4=
Answer:
Combine like terms: 18x + 15x = 33x
(45 + 33x + 6x2)
Step-by-step explanation:
Answer:
Combine like terms: 18x + 15x = 33x
(45 + 33x + 6x2)
Step-by-step explanation: