Which graph represents a direct variation

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?

Are the corresponding angles congruent? explain why or why not.

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.