If the function y

If the function y = .018 t² + -1.7 t + 88 represents depth y vs. clock time t, then what is the average rate of depth change between clock times t = 12.8 and t = 25.6?

What is the rate of depth change at the clock time halfway between t = 12.8 and t = 25.6?

What function represents the rate r of depth change at clock time t?

What is the value of this function at the clock time halfway between t = 12.8 and t = 25.6?

If the rate of depth change is given by dy/dt = .057 t + -2.5 represents the rate at which depth is changing at clock time t, then how much depth change will there be between clock times t = 12.8 and t = 25.6?

Give the function that represents the depth. What would this specific function be if at clock time t = 0 the depth is 180?