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) = 140t + 280 t + 6 , t ≥ 0, where t is the number of months he has been on the job.

  1. How many words per minute can he type the day he starts?
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    Substituting in t=0, he types 46.6 words/minute Close Pop Up
  2. How many words per minute can he type after 12 months?
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    Substituting in t=12, he types 108.8 words/minute Close Pop Up
  3. How many words per minute can he type after 4 years?
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    Substituting in t=48, he types 130 words/minute Close Pop Up
  4. How many words per minute would you expect him to type if he worked there until he retired?
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    Substituting in t=48, he types 130 words/minute Close Pop Up