If Riley places $50 in an envelope every month, how long will she need to save to be able to afford the new refrigerator?
plz help
A, 19 months
B, 21 months
C, 24 months
D, 26 months

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

I'm confused on this could anyone me and show me what i need to do to solve 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?