If a juice box is 9.12 for 12 box how much will you pay for 9 box?

A. coefficient is the number multiplied by the variable (the letter)..so one coefficient is : 10
A variable is an unknown number represented by a letter...so one of the variables is : w
A constant is just a number by itself, no letters attachedso the constant is going to be : 83.50

B. she saves for 15 weeks, and washes the car 4 times
10c + 15w + 83.50c = 4 and w = 15
10(4) + 15(15) + 83.50 = $ 348.50 <==

C. 20 bucks after each car washwould change the expression to this :
20c + 15w + 83.50...so we are changing the coefficient from 10 to 20 <=