Answer:
Multiply the first equation by -4
Step-by-step explanation:
Equation A: 3c = d − 8
Equation B: c = 4d + 8
We want to eliminate variable d
Multiply the first equation by -4
-4( 3c = d − 8)
-12c = -4d +32
Add this to the second equation
-12c = -4d +32
c = 4d + 8
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-11c = 0d + 40
A square has 6 equal square surfaces.6x^2=486x^2=486/6x^2=81x=sqrt81
x=9 ft on a side.Proof:6*9^2=4866*81=486486=486
(a+b)^3 = a^3+b^3+3ab(a+b)
(a+b)^3 = (-1)^3