Answer:
w = 13 m
l = 32
Explanation:
let 'w' = width
let '2w+6' = length
P = 2l + 2w
90 = 2(2w+6) + 2w
90 = 4w + 12 + 2w
90 = 6w + 12
78 = 6w
w = 13
length = 2(13) + 6 → 32
check:
2(13) + 2(32) should equal 90
26 + 64 = 90
90 = 90 checks out
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