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3 years ago

7

How many combinations of 5 students can a teacher choose from 24 students?

1 answer:

Rus_ich [418]3 years ago

3 0

The correct answer will be B. 42, 504.

This is a trick from University and High School Statistics.

You must think you have 24 students, and must CHOOSE 5.

On a calculator you do 24C5 (or whatever your function is for combinations) and that is how you get the answer.

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vlada-n [284]

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3 years ago

Solve: a 100-mL pitcher of lemonade is currently 90% water and 10% lemon concentrate. How much water must you add to change the

LekaFEV [45]

Answer:

Must add 100 milliliters of water

Step-by-step explanation:

Let

x ----> milliliters of water to add

we know that

<em>Originally</em>

The milliliters of lemon concentrate is equal to the 10% of 100 mL

so

$0.10(100)=10\ mL$

<em>Now</em>

The balance of lemon concentrate is equal to 5%

The milliliters of lemon concentrate is the same

so

$0.05(100+x)=10$

solve for x

$5+0.05x=10$

$x=100\ mL$

therefore

Must add 100 milliliters of water

8 0

3 years ago

719927 in expanded form

MAVERICK [17]

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6 0

3 years ago

Evaluate r^2−s^2, when r=12 and s=5.

kramer

Step-by-step explanation:

Given r = 12, s = 5,

${r}^{2} - {s}^{2} = {12}^{2} - {5}^{2} \\ = 144 - 25 \\ = 119$

5 0

2 years ago

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