Answer:
Part A: 18 + 2.25t + 2.50s
Part B: $30
Explanation:
Let t= each additional topping
Let s=each side
First we add the cost of one pizza ($18)
Then we add each additional topping (t) multiplied by its cost (2.25 dollars)
Finally we add each side (s) multplied (2.50 dollars)
Part B:
Plug in 2 for t and 3 for s into the expression from earlier and simplify:
Expression: 18 + 2.25(2) + 2.50(3)
=18+ 4.50 + 7.50
=30
And there you have it- the total cost is $30.
Hope this helps and good luck in your studies :)