Please help me! Please answer it carefully:)

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

What is the following sum in simplest form? square root 8 + 3 square root 2 + square root 32