11. Sasha is floating in an inner tube in a wave pool (waves come in a periodic pattern). She is 1.5 m from the bottom of the pool when she is in the trough (bottom) of a wave. In 1.25 s, she is on the crest (top) of a wave which is 2.1 m from the bottom of the pool. Assuming time starts when she is in a trough, determine the equation of a sinusoidal function which models Sasha's distance from the bottom of the pool in terms of time.