SOLUTION: Given: 4<a<5, 2<b<4 Find: a∙b

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Question 1140503: Given: 4 a∙b
Answer by greenestamps(13203) About Me  (Show Source):
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With a and b both positive, the minimum value of ab is when both a and b have their minimum values; the maximum value of ab is when both a and b have their maximum values.

4%3Ca%3C5 and 2%3Cb%3C4 --> 8%3Cab%3C20