Question

Gina pumps 40 cubic inches of air per second into a balloon. The function below shows the total amount of air f(t) inside the balloon after t seconds. f(w) = 40t + 5 Which statement best describes the y-intercept of the graph of the function?

Answer 1

For this case, the first thing you should know is that the intersection with the y-axis occurs when the time equals zero.
Mathematically we have:
For t = 0:
f (0) = 40 (0) + 5
f (0) = 0 + 5
f (0) = 5
Answer:
The intersection with the y-axis represents the total amount of initial air before starting to pump air.
The initial air quantity is:
5 in ^ 3

Answer 2

The y-intercept of the graph of the function is the initial amount of air inside the balloon (5 cubic inches)