Question

What expression can be used to calculate the rate per minute at which the air freshener dispenses sprays?

Answer 1

You didn't give any answers, but, I hope this will help you out a bit:

for example, if the air freshener sprays 3 times every 20 minutes,

here are our points:

(20,3), (40,6), (60,9), (80,12)

lets take the second and third point to find the slope.

$\frac{9-6}{60-20} = \frac{3}{40}$

3/40 would be the slope.

Answer 2

Okay so lets say that it sprays every 12 seconds so what you need to do is divide 12 with 60 so  60÷12=5 so it sprays 5 times per minute