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ohaa [14]
3 years ago
10

Evaluate the expression 2x-y for x=17 and y=12

Mathematics
2 answers:
Vladimir [108]3 years ago
7 0
2x-y .. if x=17 and y=12 you plug in
2(17)-12
34-12
=22
mafiozo [28]3 years ago
6 0

Answer:

The answer is 22.

Step-by-step explanation:

1) Replace the x with 17, and the y with 12.

2) 2(17) - 12

3) 2x17 = 34

4) 34 - 12 = 22

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Every evening Jenna emptied her pocket and put your change in a jar at the end of the week she counts her money one week she had
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Answer:

Jenna had 25 quarters and 15 dimes.

Step-by-step explanation:

Let Q = the number of quarters and D = the number of dimes.

Then:

1) Q+D = 40 "One week she had 40 coins, all of them dimes and quarters...."

2) 0.25Q+0.1D = $7.75 "...she had a total of $7.75."

Rewrite equation 1) as: D = 40-Q and substitute into equation 2).

2a) 0.25Q+0.1(40-Q) = 7.75 Simplify the left side.

 

2b) 0.25Q+4-0.1Q = $7.75 Subtract 4 from both sides.

2c) 0.25Q-0.1Q = 3.75 Combine the like-terms on the left side.

2d) 0.15Q = 7.75 Divide both sides by 0.15

2e) Q = 25 and:

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D = 40-25

D = 15

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