3.45 Divided by 0.89 = a little more than 3 pounds.
If 200/8=25 per hour, then i divided that by 2 to get 12.5 for 30 minutes.
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Answer: 
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How to get this answer:
Use the unit circle to note that
when
(aka 45 degrees)
Beyond this point, cosine is smaller than sine. This means that anything from 0 to pi/4 will have sine be smaller than cosine. It might help to graph y = sin(x) and y = cos(x) on the interval from x = 0 to x = pi.
The two curves y = sin(x) and y = cos(x) intersect at the point 
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Here's a more detailed picture of whats going on.

Intersect the intervals
and
and you'll end up with the final answer 
Answer:
9.9.9.9 = ( 9*1) . (9/10) + (0/100) + (9/1000) + (0/10000) +(9/100000)