78) combine logs to get

log2(x+7 / x) = 3

Then,

x+7 / x = 2^3 = 8

8x = x + 7

7x = 7

x = 1

80) L = 2W

Perimeter = 2L + 2W

substitute L with 2W to get

66 = 2(2W) + 2W

66 = 4W + 2W = 6W

W = 11

L = 22

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