Find a polar equation for the curve given by the cartesian equation y = 2x 2 .

The first has no r , only 0 since it is a straight line.

M = miles driven
S = standard charge = 15.75*0.50M
I = insurance charge = 3.70*0.25M
C = total charge

We're looking for total charge when someone pays for the standard charge, S, and the insurance charge, I, but we do not know the number of miles M. So,

C = S + M
= (15.75*0.50M) + (3.70*0.25M)
= 7.875M + 0.925M
= 8.8M

(But you may want to check your functions, as they were hard to read and may not be correct.)