Xavier has $23.50 in his savings account. he deposits $35 every week. his mother also deposits $20 into the account every time xavier washes the car. his savings account balance can be shown with the following expression: 20c + 35w + 23.50 part a: identify a coefficient, a variable, and a constant in this expression. (3 points) part b: if xavier saves for 12 weeks and washes the car 3 times, how much will he have in his account? show your work to receive full credit. (4 points) part c: if xavier’s mother deposited $25 after each car wash, would the coefficient, variable, or constant in the expression change?