the first three are primes so we just need to factor 20 20=5x2^2 so the answer is 2^2x3x5=60
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-20/2 = -10
.2 is 2/10 or 1/5. .20 is 20/100 or 2/10 or 1/5.
20 x 20 = 400 therefore 400 ft.2
20+3b = 20 + 3(-6) = 20-18 = 2
A = 2(20*30) + 2(20*12) + 2(30*12) = 2(600 + 240 + 360) = 2*1,200 = 2,400 in2