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Lyrx [107]
3 years ago
12

Which expression is equivalent to – 12 + (-4/5) + 31 and includes the correct justification for the equivalence?

Mathematics
1 answer:
anyanavicka [17]3 years ago
8 0

Answer:

b

Step-by-step explanation:

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The first side of a triangle is 7cm less than twice the second side. The third side is 4cm longer than the first side. The perim
Vinil7 [7]

Given:

First side(A): 2B - 7

Second side(B): B

Third side(C): B + 4

Plug in values:

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2B - 7 + B + B + 4 = 80

If you look at the coefficients only, you can rewrite the equation like this:

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This means that 4B - 7 + 4 = 80

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= 4B = 80 + 3

B = 83/4, so you can either write B as 83/4 or as 20.75.

Checking your work:

A: 2(20.75) - 7 = 34.5

B: 20.75

C: 4 + 20.75 = 24.75

34.5 + 20.75 + 24.75 = 80cm.

Hope this helped.

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