G. Am I doing this correctly?

dE The rate at which a machine operator's efficiency. E (expressed as a percentage), changes with respect to time I is given by -=30 -81, where t is the number of hours the operator has been at work. a) Find E(t), given that the operator's efficiency after working 2 hr is 76%; that is, E(2) = 76 b) Use the answer in part (a) to find the operator's efficiency after 3 hr. after 5 hr a) E(1)= 0076 b) The operator's efficiency after 3 hours is 36 %. The operator's efficiency after 5 hours is 5Apps