Jesse drives to work. the distance jesse’s car travels (d) on a number of gallons of gas (g) is given by the equation d = 15g. the constant of proportionality in terms of distance traveled per gallon of gas is?

I can only half answer this question, as it doesn't tell what form of distance is used

the equation is...

d=15g

Now lets solve for 1 gallon of gas

d=15g
d=15(1)
d=15

This means that for every 1 gallon of gas, 15 (insert missing unit of distance here) can be driven.

15/1=15

The constant of proportionality is 15.