List all integers that divide evenly into each,
a) 18 b)-15

Part A the coefficient is 20c and 35w, the variable is c and w representing cost and week. and the constant is 23.50.

Part B He would have 503.50 because 35(12)+60=420x+60+23.50 which would be 503.50

Part C The coefficient of the cost would change because you would be adding a 5 dollar increase done