Could someone explain how you would solve this? i really don't understand it.

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?

The value of cos 30° is the same as which of the following?

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6