Answer:
4.5 +0.6x </= 8.25
Explanation:
4.5 + 0.6x </= 8.25
4.50 is the base price, 0.6 times the number of toppings allowed has to be less than or equal to 8.25.
If you need to solve it:
0.6x </= 3.75
x </= 6.25
Since you can't have a partial topping, the answer would be no more than 6.