Geometric mean between 1/2 and 2​

What is the value of the expression below? (81^2)^1/8

Draw a scaled copy of the circle using a scale factor of 2

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)