3 years ago

I need help on math:(

Mathematics

1 answer:

Nadusha1986 [10]3 years ago

4 0

Answer:

A. 10

Step-by-step explanation:

The perimeter is the sum of all the outside lengths

Therefore, to find the value of x, you must do:

x + x + 5 + x + 7 = 42

3x + 12 = 42

3x = 30

x =10

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