i need help with C only

2. The population of Mathville is modelled by the function P(t) = -2t3 + 54t2 - 40t + 21000 where t represents the number of years since 2015. a ) What will the population be in 2023? 2015 =0 starting point P (8 ) = - 208) + 54 (8) -40 (8 )+ 21000 2023 = 8 -231 12) The population will be 231 12 people in zo23 b) Determine the average rate of change of the population from 2018 to 2028. vv 2028=13 AROC = P(13 ) - P(3) 2018 = 3. 13 - 3 = [-2(13)3+ 54(13)2-40(13)+ 21000] - [-2(3)3+54(3)"=40(3)+21000 10 = 28 2x2 - 21312 10 live = 1390 people/ year c) Determine the instantaneous rate of change of the population in 2037. V V 20 7- 22 IROC = flath ) - f ( ) fit il h Page 8 of 10