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April 25, 2015

Homework Help: Math

Posted by Melinda on Thursday, January 19, 2012 at 3:36pm.

Would someone verify these answers.

1. 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 15s, 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?

a)y=4sin(20pi/15 x t)
b)y=4sin(30pi/20 x t)
c)y=4sin(40pi/15 x t)
c)y=8sin(30pi/20 x t)

Answer: A
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2. Which of the six trig functions are positive in quad III?

Ans: Tangent and cotangent
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3. What is the exact value of sin(3pi/2)?

Answer: 3pi/2=270 degree, equals to -1

Therefor exact value -1.

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