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For OTA 103997 or 103877 only/Calculus Help

1. The position equation for the movement of a particle is given by when s is measured in feet and t is measured in seconds. Find the acceleration at two seconds.
2. Find the derivative: .
3. Find if .
4. The radius of a circle is increasing at the rate of 5 inches per minute. At what rate is the area increasing when the radius is 10 inches?

(Questions attached to show proper equations and questions)
Please show me your work for this one.