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inysia [295]
3 years ago
11

Anyone help me solve this? And show work please

Mathematics
1 answer:
inessss [21]3 years ago
4 0

Answer:

A) 2a + 6

Step-by-step explanation:

(5a + 3) + (2a + 3) + x = 9a + 12

Add both side lengths plus the unknown side to equal the perimeter.

7a + 6 + x = 9a + 12

-7a -6          -7a   -6          Subtract 7a + 6 on both sides

x = 2a + 6 This is the missing side length.

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