Answer: The answer is 785.4
Step-by-step explanation: Equation is 2πrh+2πr²
Plug in your numbers and hit enter!
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On day no 9, because to increase her mileage by 4 to reach 8 it will take her 4/0.5=8 days plus day 1 where she ran just 4 miles.
Recall that

Dividing both sides by cosh²(x) gives

Also, recall the identity

Then

The answer to the question is a