Answer:
Part A- $15T+$5C=$900
Part B-
1. $15(40)+ $10(30)=$900
2.$15(30)+ $10(45)= $900
3.$15(20)+ $10(60) =$900
Explanation:
Part B
The max number of shirts you can sell is 60 because 15x60=900 but we want to see the max shirts AND hats. You can use almost any number (that ends in 5 or 0) less than 60. Such as 50 or 10 for how many shirts you sold then subtract that from 900 then divide that number by 10 because that's how much the hats cost then put that number in for C in your equation.