The average daily temperature, t , in degrees Fahrenheit for a city as a function of the month of the year, m , can be modeled by the equation graphed, where m is equal to 0 represents January 1 , m is equal to 1 represents February 1, m is equal to 2 represents March 1 , and so on. If the equation is t is equal to A cosine open paren pi over 6 times open paren m plus 1 close paren close paren plus k , what are the values of A and k ?