A person waves his hand back and forth, where their finger tips move past the starting position 4 cm in each direction. If he waves 20 times every 15 s, what sine equation models the movement of the hand if the hand starts in the upright position and the right direction will be taken as positive? 3π y = 8 sin (3 t) O O y = 4 sin (4) 3 y = 4 sin(t) y = 4 sin (37

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