The function P(x)=−1.5x^2+ 900x−4500 gives the profit when xunits of a certain product are sold. Find
a) the profit when 75 units are sold  dollars
b) the average profit per unit when 75 units are sold dollars perunit
c) the rate that profit is changing when exactly 75 units are solddollars per unit
d) the rate that profit changes on average when the number of unitssold rises from 75 to 150. dollars per unit
e) The number of units sold when profit stops increasing and startsdecreasing. (Round to the nearest whole number if necessary.)
    units
