We use the vertical side as the base: it is a vertical segment, so it's length is the difference of the y coordinates of its endpoints:
The height would be the segment starting from 
, perpendicular to the base. Since this is a horizontal segment, its length is the difference of the x coordinates of its endpoints:
So, the area is given by
Answer:
12x = 84
Step-by-step explanation:
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2x 4 =- 8
2 x + 4 = 8 2x+4=8 2x+4=8. Subtract 4 from both sides. Simplify 8 − 4 8-4 8−4 to 4. Divide both sides by 2.
V = a^3
729 = a^3
9^3 = a^3
9 = a
answer. side length = 9 in
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