The median home price in the United States over the period January 2010–January 2015 can be approximated by:   P(t) = 4.5t2 − 15t + 180 thousand dollars (0 ≤ t ≤ 5)   where t is time in years since the start of 2010.† Find P'(t) and P'(3) P'(t)= P'(3)=___ thousand dollars per year

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