Simplify (r5)(3r5), ! i'm struggling

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?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

In the diagram, a building cast a 35-ft shadow and a flagpole casts an 8-ft shadow. if the the flagpole is 18 ft tall, how tall is the building? round the the nearest tenth.