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?
A. It is equal to 40 and represents the amount of air already present in the balloon before Gina starts blowing.
B. It is equal to 5 and represents the amount of air already present in the balloon before Gina starts blowing.
C. It is equal to 5 and represents the amount of air in the balloon after 1 second.

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- anonymous

or D. It is equal to 45 and represents the amount of air in the balloon after 1 second.

- skullpatrol

Any ideas?

- anonymous

D?

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## More answers

- skullpatrol

First of all you have to know what is the value of the y-intercept?

- anonymous

40?

- skullpatrol

In the equation:
y = mx + b
b is the y-intercept.

- anonymous

oh ok

- triciaal

the y intercept means when t = 0

- anonymous

oh

- triciaal

what is your choice?

- anonymous

A?

- triciaal

put both responses together

- anonymous

so then whats the answer?

- triciaal

the y-intercept is the value of the function when t = 0 in your equation y = mx + b the y-intercept = b

- triciaal

|dw:1438102215426:dw|

- anonymous

i dont get it lol

- anonymous

so then the answer is?

- triciaal

|dw:1438102498957:dw|

- triciaal

|dw:1438102589362:dw|

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