9. You run a business making birdhouses. You spend $600 to start your business, and it costs you $5.00 to make each birdhouse.
# of birdhouses
1
2
3
4
5
6
7
Total cost to build

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!