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Midline of sinusoidal functions from graph

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Below is the graph of a trigonometric function. It has a maximum point at left parenthesis, 1, point, 2, comma, 5, point, 5, right parenthesis and an amplitude of 3, point, 5.
A graph of a trigonometric wave on an x y coordinate plane. The x and y axes scale by one. There is a point on the highest part of the graph labeled (one and two tenths, five and one half).
What is the midline equation of the function?
y, equals
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text