Posted by **samantha** on Saturday, May 11, 2013 at 11:43pm.

the productivity of a person at work (on a scale of 0-10) is modeled by a cosine function: 5cos (pie/2t) +5, where t is in hours. If the person starts work at t=0, being 8:00 am, at what times is the worker the least productive?

a) 12pm

B) 10 am and 2pm

C) 11 am and 3 pm

D) 10 am,12pm and 2 pm

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