Question

An online music store sells songs for $0.90 each.a. Write a function that you can use to find the cost C of buying s songs. b. What is the cost of buying 5 songs?

Answer 1

Let C be the total cost for buying s songs, then since the cost of each song is $0.90 we can set the following equation:

$C=0.90s\text{.}$

Now, if we substitute s=5 in the above equation we get:

$C=0.90(5)=\frac{9}{2}=4.5.$

Answer:

a)

$C=0.90s\text{.}$

b) $4.5.