A plumber charges $55 per hour and spends $20 a daily on gasoline. Write an algebraic expression to represent his net earning for a day

17. 11x - 11y  or  11x + (-11y)

18. -7.52 - 2.8  or  -7.52 + (-2.8)

19. 41x - 21y - 6

20. -3y -8xy

Step-by-step explanation:

17. Use the distributive property.

18. Use the distributive property to multiply each number inside the parentheses by 0.4

19. Multiply each number inside the parenthese by 7.

20.Multiply each term in parenthese by y.