A block of steel is 1 foot 6 inches long, 4 inches wide, and 2 inches tall. It weighs 12.5 pounds. To the nearest pound, what is the density in pounds per cubic feet? A.) 140
B.) 150
C.) 100

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!