I'm in 1st year university, please keep answers to that level

Question 2 (8 points) Chain Rule The following graph shows the approximate value of home prices and existing home sales as a percentage change from 2003, together with quadratic approximations, such that: Home prices and sales of existing homes 40 . Prices 30 20 -10 Sales 2 3 -20 -30 2006 2010 Home prices: P(t) =12 -10t +41 Osts4 Existing Home sales: S(t) =1.512 -1 1t Osts4 where t is time in years since the start of 2006. a) Determine as (6 points) dP b) Interpret contextually your findings in question a) above. (2 points)