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ziro4ka [17]
3 years ago
11

In a high school, 7% of the students play the piano. This is 21 students. Choose the expressions that complete each step involve

d in setting up and solving the proportion that represents the situation.
Set up a proportion:

Cross multiply:
Mathematics
1 answer:
Gnesinka [82]3 years ago
7 0

Hello,

<u>Set up a proportion</u> :

7 → 21

100 → ?

<u>Cross multiply</u> :

100 * 21 / 7 = 300 students

Bye :)

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Let A = {1, 2, 3, 4, 5} and B = {2, 4}. What is A ∩ B?
tatyana61 [14]

Answer:

A ∩ B = {2, 4}

Step-by-step explanation:

Definition: The intersection A ∩ B of two sets A and B is the set that contains all elements of A that also belong to B.

For example:

If x∈A and x∈B

then;

x∈ A ∩ B

Given the sets:

A = {1, 2, 3, 4, 5} and B = {2, 4}

We have to find  A ∩ B.

By definition we have;

A ∩ B = {2, 4}

Therefore, the value of  A ∩ B is, {2, 4}

4 0
3 years ago
Compute the value of each expression 7−17
serg [7]

Answer: -10

Step-by-step explanation:

7 - 17 = -10.  An easy way to do this (with only two terms) is to just flip it, and do 17 - 7 = 10, then make 10 negative(-10)

Hope it helps <3

4 0
3 years ago
Need help with this one.
Stolb23 [73]

Answer:

1. 120

2. 2600

Step-by-step explanation:

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2000+120(5)

2000+600

=2600

5 0
3 years ago
(70 points)
meriva
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Answer C)
8 0
3 years ago
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What is the value of​ x?
olchik [2.2K]

Answer:

x = 4 sqrt(2)

Step-by-step explanation:

This is a right triangle so we can use trig functions

sin theta = opp/ hypotenuse

sin 45 = 4/x

Multiply x to each side

x sin 45 = 4/x *x

x sin 45 = 4

Divide each side by sin 45

x sin 45 / sin 45 = 4 /sin 45

x = 4/ sin 45

We know sin 45 = sqrt(2)/2

x = 4/ sqrt(2) /2

x = 8/ sqrt(2)

We do not leave a sqrt in the denominator so multiply by sqrt(2)/ sqrt(2)

x = 8/ sqrt(2) * sqrt(2)/sqrt(2)

x = 8 * sqrt(2) /2

x = 4 sqrt(2)

3 0
3 years ago
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