9. The average monthly temperature of Richmond Hill can be modeled using the function T(n) = 20 sin 3001 3) + 12, where T01) represents the temperature in Celsius and n = 0 represents January 132 n : 2 represents February 13', and so on. [6 marks] a) What is the period of the function? w/ b) Sketch the graph of 2 cycles of the function. VJ c) When is the average monthly temperature highest during the 1-\" cycle? v\" d) Determine the average monthly temperature on September 13'. f \f8. Fill in the blanks and find the equation for the following sinusoidal function. [7 marks] 5 ' ' j . ' Amplitude: 4-150 f -300 -150 -. 0 150 300 .- 450 600\" 750 Period: ' Vertical displacement: -10 '-O-! For the gositive cosine function For the reflected sine function Phase shift: Phase shift: Equation: Equation