Write down 3 numbers where the following are true:
the total of the 3 numbers 20.
the product of the 3 numbers is 90.

10, 4, and 6 for number 1 and
31, 38, 21 for number 2

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!