1) Afterthours of work, a bank clerk can process checks at the rate ofr(t)

checks per hour for the functionr(t)

given below. How many checks will the clerk process during the first three hours (time 0 to time 3)?

r(t) =t²+80t+8

2)A company's marginal cost function isMC(x)

(given below), wherexis the number of units. Find the total cost of the first hundred units(x= 0

tox= 100).

(Round your answer to the nearest cent.)

MC(x) =3e^0.02x