a linier functin of h models a relationship in which the dependent varible increses 1 unit every 5 units the independent varible decreses the value of the function at 0 is 3

How many zeros does the function f(x)=4x3-x2+1 have

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Can someone me and do the problem plz so i can understand it more better