F(x) = 15 -- 3x and g(x) = 10 - 4x

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.

Which of the following tables represents exponential functions?

Need asap. solve for the following inequality