Which polynomial is factored completely?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Simplify the following expression 48^1/2

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.