1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
solong [7]
3 years ago
10

The scale of a model train is 1 inch to 13.5 feet. One of the cars of the model train is 5 inches long. What is the length, in f

eet, of the actual train car?
Mathematics
1 answer:
VMariaS [17]3 years ago
8 0
1 inch = 13.5 feet

5 inches = 5 * 13.5 = 67.5 feet
You might be interested in
The quotient of y and 6 is 29 find the value of y
atroni [7]
Y÷6=29
y=29 x 6
y=174

Hope I can help u
7 0
2 years ago
Which property is represented in the following equation: 3 + 4 = 4 + 3
Delicious77 [7]

Answer:

Commuttative Property for Addition

Step-by-step explanation:

There is the answer above

7 0
3 years ago
Fewer young people are driving. In 1983, 87% of 19-year-olds had a driver’s license. Twenty-five years later (in 2008) that perc
Dima020 [189]

Answer:

a) ME=1.96\sqrt{\frac{0.87 (1-0.87)}{1200}}=0.019  

b) ME=1.96\sqrt{\frac{0.75 (1-0.75)}{1200}}=0.0245  

c) On this case it's not the same since the proportion estimated for 1983 it's different from the proportion estimated for 2008. So since the margin of error depends of \hat p the margin of error change for part a and b.

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

If solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=\pm 1.96

If we replace the values into equation (a) for 1983 we got:

ME=1.96\sqrt{\frac{0.87 (1-0.87)}{1200}}=0.019  

Part b

Since is the same confidence level the z value it's the same.  

If we replace the values into equation (a) for 2008 we got:

ME=1.96\sqrt{\frac{0.75 (1-0.75)}{1200}}=0.0245  

Is the margin of error the same in parts (a) and (b)? Why or why not?

On this case it's not the same since the proportion estimated for 1983 it's different from the proportion estimated for 2008. So since the margin of error depends of \hat p the margin of error change for part a and b.

3 0
3 years ago
Help! Due in about 2 hours
ExtremeBDS [4]
1. 672/12 = 56
2. 1440/16 = 90
3. 784/7 = 112
7 0
1 year ago
I know how to do it but right now I'm cooking and have no time please say if the first part is right and the second part will be
Triss [41]

Part A is correct. We have x+15 as the length and x+3 as the width. Convention usually has the width be the smaller of the two.

------------------

Part B will have you replace x with 8 and simplify

length = x+15 = 8+15 = 23

width = x+3 = 8+3 = 11

the rectangle is 23 yards by 11 yards, so the area is 23*11 = 253 square yards

4 0
3 years ago
Read 2 more answers
Other questions:
  • Match each word problem to the equation that models it. tiles the sum of the squares of two positive integers is 394. if one int
    13·1 answer
  • This right square pyramid has a base length of 4 inches and a slant height of 7 inches what is the surface area of this pyramid?
    12·1 answer
  • Plzzzz need answers​
    7·1 answer
  • What is the value of x?
    12·1 answer
  • 2.06: similar triangles practice quiz
    14·1 answer
  • Three lines intersect to form the triangle shown below. What is the value of x in degrees?
    6·1 answer
  • Two more than 4 times the cube of a number is 34.
    5·1 answer
  • 2 x 5/6<br><br> Help me please
    9·2 answers
  • What is the slope of y-9=3(x-2)<br> A. 3<br> B. 1/2<br> C. 2<br> D. 1/9
    14·2 answers
  • I need helpppp!!<br> Find the volume of the sphere. Round to the nearest tenth.<br> d = 9
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!