How do i solve this? ? i did not learn this

What is the relationship between all triangles that can be drawn given the same three angles

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?

Ineed to know how to write question one in mathematical terms