You download 4 songs for $5. Write an equation that uses the constant of of proportionality to describe the relationship between the cost in d dollars
for s songs.

The equation is;

d = 1.25s

Step-by-step explanation:

Here, we start by getting the price of a single song

From the question;

4 songs = $5

Thus, 1 song will be $5/4 = $1.25

So the proportionality constant is $1.25 per song

To write the relationship, we have;

d = 1.25s

Where d is the cost in dollars and s is the number of songs

the answer is n