Answer:
Step-by-step explanation:
8x - 8 = 7x + 8
x - 8 = 8
x = 16
8(16) - 8= 128 - 8 = 120
7(8) + 8 = 56+8 = 64
Perimeter = 14
Area =
6 inches
A=b1+b2/2*h
Fill in the equation with what we know
21=8+x/2*3
Isolate x
Quick steps: 21/3=7*2=14-8=6
x=6
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