The function below shows the cost of an ice cream sundae with different numbers of
toppings (t).
f(t) = 2.25 +0.75t

a. What is the y-intercept, and what does it mean?
b. What is the slope, and what does it mean?
c. If Kaye paid $6.00 for a sundae, how many toppings were on Kaye's sundae?