Ask question

Ask question

All categories

3 years ago

12

A student builds a model of a race car. The scale is 1:15. In the scale model, the car is 8 cm tall. How tall is the actual car?

A. 0.53 cm B. 23 cm C. 120 cm D. 1.9 cm

1 answer:

zvonat [6]3 years ago

3 0

Answer:

c

Step-by-step explanation:

let the actual height of the car be represented by x

now to the question

1/15 = 8/x

x=15×8

x=120cm

height of car= 120 cm or 1.2 M

You might be interested in

student randomly receive 1 of 4 versions(A, B, C, D) of a math test. What is the probability that at least 3 of the 5 student te

alexdok [17]

Answer:

1.2%

Step-by-step explanation:

We are given that the students receive different versions of the math namely A, B, C and D.

So, the probability that a student receives version A = $\frac{1}{4}$ .

Thus, the probability that the student does not receive version A = $1-\frac{1}{4}$ = $\frac{3}{4}$ .

So, the possibilities that at-least 3 out of 5 students receive version A are,

1) 3 receives version A and 2 does not receive version A

2) 4 receives version A and 1 does not receive version A

3) All 5 students receive version A

Then the probability that at-least 3 out of 5 students receive version A is given by,

$\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}\times \frac{3}{4}$ + $\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}$ + $\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}$

= $(\frac{1}{4})^3\times (\frac{3}{4})^2+(\frac{1}{4})^4\times (\frac{3}{4})+(\frac{1}{4})^5$

= $(\frac{1}{4})^3\times (\frac{3}{4})[\frac{3}{4}+\frac{1}{4}+(\frac{1}{4})^2]$

= $(\frac{3}{4^4})[1+\frac{1}{16}]$

= $(\frac{3}{256})[\frac{17}{16}]$

= 0.01171875 × 1.0625

= 0.01245

Thus, the probability that at least 3 out of 5 students receive version A is 0.0124

So, in percent the probability is 0.0124 × 100 = 1.24%

To the nearest tenth, the required probability is 1.2%.

4 0

3 years ago

In triangle ABC below , which of the following can NOT be the length of the missing side?

lilavasa [31]

Answer:

2 cm

Step-by-step explanation:

the sum of the two shorter sides must be longer than the third side

6 0

3 years ago

I believe in u do my school work yah!!!!

nataly862011 [7]

Answer:

whatever the answer is A cause i did my calculations and i got A

5 0

3 years ago

Read 2 more answers

Solve these equations. Show solutions on a number line.<br><br> |x-7|=x-7

Snezhnost [94]

Answer:

X is equal to or greater than 7

Step-by-step explanation:

Since lx-7l is equal to x-7, this means that it can only work on places where the lines are on top of each other. In terms of x, this means that x must be at least 7. As you can see in the number line also attached.

7 0

3 years ago

1/12 ? 1 =1/12 which is it multiply or divide. Please explain how you got it.

Ivanshal [37]

It is multiply because 1/12 x 1 = 1/12 so that's why it is multiply.

6 0

3 years ago