(a)

Question

T(m) = −22.75 cosπ/6(m − 1) + 52.55 = 48

m =

Answer 1

−22.75 cos (π/6(m − 1)) + 52.55 = 48
-22.75 cos ((π/6)(m-1)) = -4.55
cos ((π/6)(m-1)) = .2
((π/6)(m-1)) = 1.369438... or ((π/6)(m-1)) = 4.9137459..
m-1 = 2.61543.. or m-1 = 9.38456..
m = 3.615435 or m = 10.38457

adding/subtracting 2π to each answer will produce a new answer.