Find the area of a triangle with base of 15 m and altitude of 12 m.

Triangle Area = .5 * base * height
Triangle Area = .5*15*12
Triangle Area = 90

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!