Transforming Polynomial Functions

Question

The number of cars sold per month can be modeled by f(x) = 0.04x3 + 0.2x2 + 0.5x + 60, where x represents the number of months since March. Let g(x) = f(x) + 30. Which of the following gives the rule for g and the correct explanation of the meaning of the transformation in terms of monthly car sales? 

Answer 1

g(x)=.04x^3+ .2x^2+.5x+90

just add 30 to f(x)

it means 30 more cars sold each month

f(0)=60, g(0)=90