An administrative assistant is hired after graduating from high school and learns to type on the job. The number of words he can type per minute is given by

where t is the number of months he has been on the job.

a. How many words per minute can he type the day he starts?

b. How many words per minute can he type after 12 months?

c. How many words per minute can he type after 3 years?

d. How many words per minute would you expect him to type if he worked there until he retired?

An administrative assistant is hired after graduating from high school and learns to type on the job. The number of words he can type per minute is given by N(t) = 130t + 260 / t +5 where t is greater or equal to 0.