Mathematics

Augustus Orr

3 March, 10:15

A cell phone plan uses a fixed charge of $20 per month plus 10 cents for each minute used to calculate the total bill. The total bill, t, can be expressed in terms of the number of minutes, m, by the function rule t=20+0.10m. If the data on the top row of the table represents the independent variable, which set of data represents the inverse function?

m 0 1 2 3

t 20 20.10 20.20 20.30

t 0 1 2 3

m 20 20.10 20.20 20.30

m 20 20.10 20.20 20.30

t 0 1 2 3

t 20 20.10 20.20 20.30

m 0 1 2 3