pre calculus help

Help me study for my Calculus class. I’m stuck and don’t understand.

4. A point on the outer edge of a 48.0 cm wheel can be described by the equations and .Find the magnitude and direction of the velocity of the point for .(4 decimal places and final direction in degrees NOT radians)

(5 marks)

5.The energy E (in J) dissipated by a certain resistor after t seconds is given by.At what time is the energy dissipated the greatest?

(4 decimal places)(4 marks)

3. Find the equation of the line tangent to the curve of , where x = 1.

(4 decimal places)(4 marks)

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