Me with this question. what is the area?

The formula for that area would be A=1/2xbxh so you would do A=1/2x3.5x3 and that equals 5.25

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!