Use the total-cost and total-revenue func-tions in Exercises 75 and 76 to find the rate at which to-tal profit is changing when items have been producedand sold.

Francis is getting new carpet tiles in his living room and den. his living room and den are connected. he needs to figure out how much carpet he needs and the cost involved. if each tile costs $2.00 per sq ft, how much would it cost to have new tile put in the den? a) $24 b) $36 c) $48 d) $54 plz awnser soon