Jessica wants to record her favorite songs to one CD. The function C=80-3.22n represents the recording time C available after n songs are recorded. Find the zero of this function. Describe what this value means in this context.

Question

anonymous · Answer

We put y and x as zeros to get the zero of a function. Lets start with x.

C = 80 - 3.22n
C = 80 - 3.22(0)
C = 80 - 0
C = 80

So C = 80, when x = 0

Now we do y
(C is equal to the y axis when on the graph, because that is the outcome of the manipulation)

We do inverse operation.

C = 80 - 3.22n
0 = 80 - 3.22n
(subtract)
-80 = 3.22n
(divide)
-24.8447 = n

When C = 0, n = -24.8447

anonymous · Answer

thanks