Let
x---------> the number
we know that
[9+2x]*4=4x+12
36+8x=4x+12
8x-4x=12-36
4x=-24
x=-24/4
x=-6
the answer is
-6
Answer:
C.
Step-by-step explanation:
You have 5 sides
Front 1x6x5=39
Bottom 1x6x3=18
Back 1x6x4=24
Two triangles 2x1/2x3x4= 12 triangle is 1/2bh
Add 39+18+24+12= 93 sq cm