Answer fast
how can you use functions and graphs to represent periodic data?

Graphs can be used to represent periodic data because you can show rise and fall of something and express situations that may be tough to show in writing.

In the case that the periodic data is on the range of the function the y axis 

You can use functions to represent periodic data:
 
example y=sin x

Letter c so sorry if i’m wrong ):

There would be 36.35 pounds