Need help with calculus

Question 6 (5 points) Jimmy decides to mow lawns to earn the money. The cost of his electric lawnmower is $400. Electricity and maintenance costs are $7 per law. a. Formulate a function C(x) for the total cost of mowing x lawns. b. Jimmy determines that the total profit function for the lawn mowing business is given by p(x) = 10x-400 Find the function for the total revenue from mowing x lawns. c. How much does Jimmy charge per lawn? d. How many lawns does Jimmy now mow before he begins making a profit