Can someone explain this to me please and answer ?

Find the equation using the point (4,8)

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.