Answer:
Part A: she will buy 13 pizzas
Part B: 149.50 dollars
Explanation:
Part A: always plan for more than usual, so 4 times 13pizzas = 52 the problem said that about 40 to 50 people are coming so 52 is close
Part B: There are 13 pizzas and each cost 11.50 dollars so, see the picture for the explanation