Exercises Define a variable. Then write each phrase as an algebraic expression. 1. one more ball than is on the playground 2. three more cookies than are in the jar 3. twelve fewer questions than were on the first test 4. eight dollars more than the shirt costs 5. PLUMBING A plumber charges $50 to visit a house plus $40 for every hour of work. Define a variable and write an expression to represent the total cost of hiring a plumber