Answer: the answer is D = 210cm
We know that
<span>total surface area of the composite solid=surface area of the pyramid+surface area of the cube
surface area of the pyramid=4*area of lateral triangle side
area of lateral triangle side=12*9/2----> 54 in</span>²
surface area of the pyramid=4*54---> 216 in²
surface area of the cube=5*[12*12]----> 720 in²
total surface area of the composite solid=216 in²+720 in²---> 936 in²
the answer is the option
<span>936 square inches </span>
A because the starting values is not a negative
Convert 2 1/2 to improper fraction
= 5/2
5/2 * 1/3 = (5*1) / (2*3) = 5/6
