Question

An olympic swimmer is having his laps timed during practice. To be aware of his progress, the results are shown as order pairs (l, t) below: (1,19), (2,38), (3,57) (4,76). Which equation represents t, the time in seconds, as a function of l the number of laps that the swimmer has finished?

A: t(l) = l + 19
B: l(t) = t/19
C: l(t) = 19t
D: t(l) = 19l

Is it "C"

Answer 1

"represents t, the time in seconds, as a function of l the number of laps"
means that l is the independent variable, and t(time) is the dependent variable. Therefore you only have a choice between A and D. Choose the one with the correct relation.