Equations of circles check

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.

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Find cot x if sin x cot x csc x = √2