Does anyone understand this? could anyone let me know how to work out?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

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?