1 answer:
4. By the fundamental theorem of calculus,


is increasing on those intervals where

. So you have

which is clearly positive for

, and in the second interval you have

Together, this means

for all

.
5. When

,

reduces to

, so you have


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He studied for 8617.5 minutes.
You can simply put the equation as 9x = 36 and divide by 9, then x = 4
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Step-by-step explanation: