The price of an item is initially $700. For the first 4 years the price increases by $30 each year. For the next 5 years the price decreases by $30 per year. From then on the price increases by $15 per year. Find a piecewise-defined function P that specifies the price of the item after t years have passed. Let P(t) = the price of the item in dollars after t years have passed. (Note: Do not use $ signs within your answers.)