Can someone me on question 1 2 3 4 5

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Solve the system of equations. y= 2x y= x^2 - 15

Which of the following is a function? a.) {(-2, -4/5), (-1,-,,-1)} b.) {(-2,,1/,3/,1)} c.) {(-22)} d.) {(-21)}