The prices per barrel of crude oil in the period 1980-2013, in constant 2014 dollars, can be approximated by P(t) = 0.27(t-1980)2-8.6(t-1980) + 93 dollars, (1980 ≤ t ≤ 2013), where t is the year. Find P'(t) and P'(2010). What does the second answer tell you about the price of crude oil?