Answer:
A: x=1cm
B: x=2.1cm
C: x=7km
36/4=8
Each side must equal 8cm
8-7=1
x=1
2x + x =3x
3x x 2 = 6x
12.6/6=2.1cm
3x+5x+4x=12x
84/12=7
x=7
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