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xz_007 [3.2K]
3 years ago
5

Select each expression that is equivalent to 3(n+6).

Mathematics
2 answers:
Tasya [4]3 years ago
5 0
Just set each expression equal to 3(n+6). If you get the same answer on both sides (x=x) then that expression is equivalent! :)
Sophie [7]3 years ago
5 0

Answer:

n=-6

Step-by-step explanation:

Equate the equation to zero

3(n+6)=0

Open the bracket

3n+18=0

Substrate 18 from both sides

3n=-18

Divide both sides by 3

n=-6

Therefore the answer to that given equation is -6

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Answer:the number of pounds of blueberry granola that she should put in the mixture is 10 pounds.

the number of pounds of apple granola that she should put in the mixture is 20 pounds

Step-by-step explanation:

Let x represent the number of pounds of blueberry granola that she should put in the mixture.

Let y represent the number of pounds of apple granola that she should put in the mixture.

She wants to make a 30 pounds mixture. This means that

x + y = 30

A store is selling a mixture of apple granola and blueberry granola for $6.99 per pound. This means that the cost of the 30 pound mixture would be

30 × 6.99 = $209.7

Blueberry granola costs $8.99 per pound and apple granola costs $5.99. This means that

8.99x + 5.99y = 209.7 - - - - - - - - - -1

Substituting x = 30 - y into equation 1, it becomes

8.99(30 - y) + 5.99y = 209.7

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y = - 60/ -3

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Substituting y = 20 into x = 30 - y, it becomes

x = 30 - 20 = 10 pounds

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Answer: She will need 142 ft of curtain.

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