Cross product for 4/42 = 8/84 (its fractions)

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

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.