Answer:
$32.5
Step-by-step explanation:
I hope this helps.
From the table we can see:
Number of songs: Cost:
0 $ 0
1 $1.25
2 $2.50
3 $3.75
4 $5.00
Therefore the rate of change is: (2.50 - 1.25) / ( 2 - 1 ) = $1.25
Answer:
It means that : C. The cost increases $1.25 for each additional song that is downloaded.
Equating the formula (d is the diameter)

d^2/4 = 132.7
d^2 = 132.7*4/

d =

d = 13.0017147331
d= 13cm