3x-4y=65? what is the value of x? when y=4

Can someone me do math because i am having a breakdown rn because i don’t get it

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

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?