Answer:
The answer is
for p<5
F(p)=50-p(12.25)
Step-by-step explanation:
First we stablish that 4 is the maximun number of pizzas he can buy as
50/12,25 = 4,08
then we know that he will receive change iqual to the original amount he has less the number of pizzas he buy multiplied for the cost of each pizza.