6. The graph shows the average monthly temperature, degrees Celsius, for Thompson, MB. The data can be modeled by an equation of the form y = a cos b(x-c)+ d 30 20 10 -10 -20 2 4 O 6 8 10 12 Determine the equation represented by this graph. Recall that when the directing word "determine" is used, steps need to be shown and/or explained. Show a calculation or explain your process for finding each value a, b, c & d. (3 marks)