At a local pizza parlor, patrons have 2 choices of cheese and 10 choices of topping. in how many different ways can a patron choose 1 type of cheese and 1 type of topping?

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?