Please Help Pre Calculus?

Christopher

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The price of an item is initially $900. For the first 3 years the price increases by $20 each year. For the next 6 years the price decreases by $30 per year. From then on the price increases by $35 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.

(a) When 0 < t 3, the value of P(t) is given by what part of the piece-wise-defined function?

(b) When 3 < t 9 the value of P(t) is given by what part of the piecewise-defined function?

(c) When t > 9 the value of P(t) is given by what part of the piecewise-defined function?
 
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