Mr. Kim is selling his old Ace of Base CDs. If he sells each CD at a price of X dollars, the quantity of CDs sold will be (-1,000x + 40). What price will maximize the revenue he earns?

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!