Question

For a car travelling at a constant speed of 80km/h, the distance driven, d kilomtres, is represented by d(t)= 50t, where t is the time in hours. The cost of gasoline, in dollars, for the drive is represented by C(d)= 0.07d.

a)Determine C(d(8)) numerically and interpret your result.

b)Describe the relationship represented by C(d(t)).

Answer 1

d(8) = 50*8 = 400 km

C(400) = .07 * 400 = $ 28

or C (t) = .07 * 50 * t = 3.5 t

Answer 2

Thank you