70 square feet on the ceiling, and another 70 square feet on the floor. We don't know
how many square feet on the walls unles we know the height of the ceiling.
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sqrt(10x)*sqrt(8x) = sqrt(80x2) = sqrt(16x2*5) = sqrt(16x2)*sqrt(5) = 4x*sqrt(5)
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5
12
2-10x = -8