Period = 1080 degrees = 1080 x pi / 180 = 6pi
Now, General eqn for wave = A sin(wt + C) + D
A = amplitude = 3.5
w = angular frequency
T = period = 6pi
w = 2pi / T = 2pi / 6pi = 1/3
So, our equation becomes = 3.5 sin(t / 3 + C) +D
max point is at (0, 4). Put it in the equation
so, y = 3.5 sin( t /3 + C) + D
where maximum value of y could be 4.
Maximum of 3.5 sin( t /3 + C) is 3.5.
Means D has to be 0.5 to make the maximum value of whole y to be 1
C could be any value. No information is given to find C.