I need help I’m failing

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Bring the fraction a/a-4 to a denominator of 16-a^2

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm