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What is the right choice for question 3) ? http://postimg.org/image/8p0skkfaf/

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lkballer24 | Student, Grade 11 | Valedictorian

Posted August 17, 2013 at 10:08 PM via web

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What is the right choice for question 3) ?

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted August 18, 2013 at 12:27 AM (Answer #1)

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General formula for graphs of sine are:  `y= Asin(Bx-C)+D`  

A:  amplitude(vertical stretch) ;  B:  B=`(2pi)/P`

C:  phase shift `C/B`

D:  vertical shift

therefore amplitude (A) gives us y = 2sin, B is `(1)/(2)`

C is `pi/8`

because `pi/4-: 1/2=pi/8`

D is 1

therefore the correct equation is:  `y=2sin(x/2 -pi/8) + 1`

which indicates choice "d"

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