Q3: To show further competence in the use of calculus you need to provide answers to the following questions. The power (in watts) from an engine is represented by the equation below: P=100 t 4 + 6 t, where t is the time in seconds. a. Draw the graph that represents power against time for this engine. b. Show the area on the graph which represents the energy produced between 5 s and 15 s. C. Show, using summation, how you would gain an approximation for the energy. d. Using integration, evaluate the exact energy between 5 s and 15 s