2 years ago

Please help math part2

Mathematics

1 answer:

Keith_Richards [23]2 years ago

5 0

How I got my answer before was substitution!

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A ratio of boys to girls in the classroom is 4 to 5 if there are 20 girls how many boys would there be

Viktor [21]

Answer:

16 to 20

Step-by-step explanation:

Let's do our math.

4 to 5

8 to 10

12 to 15

16 to 20

In order to get to 20, you'd have to multiply 5 by 4. So in order to get an equal ratio, you multiply 4 by 4 and get 16.

I hope this helps!

-No one

8 0

1 year ago

I will mark you as the brainiest if you get this correct<br> Thx so much xxx

solong [7]

Answer:

A= 168 minutes or 2 hours and 48 minutes.

B= 3 tyres

Step-by-step explanation:

4 0

2 years ago

The director of the library believes that 14% of the library's collection is checked out. If the director is right, what is the

Ksivusya [100]

Answer: 0.2643

Step-by-step explanation:

Let p be the population proportion and $\hat{p}$ be the sample proportion .

As per given question , we have

$p=0.14\\\\ \hat{p}=0.13\\\\ n=478$

z-score : $\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

$z=\dfrac{0.13-0.14}{\sqrt{\dfrac{0.14(1-0.14)}{478}}}\\\\=-0.630087269176\approx-0.63$

The required probability ( using z-table ):-

$P(z$

Hence, the probability that the proportion of books checked out in a sample of 478 books would be less than 13% = 0.2643

5 0

3 years ago

Each of five friends has between $3.50 and $4.25. Which could be the total amount of money the five friends have?

sleet_krkn [62]

The answer would be around $20

7 0

3 years ago

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What is the value of a, b, and c in the quadratic equation -2x^2+4x-3=0

amm1812

A = -2
b = 4
c = -3

They are the coefficients to the terms in the equation<span />

6 0

3 years ago

Read 2 more answers