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anonymous
 one year ago
A sound wave is modeled with the equation y= 1/4 cos 2pi/3 theta.
A. Find the period. Explain your method.
B. Find the amplitude. Explain your method.
C. What is the equation of the midline? What does is represent?
anonymous
 one year ago
A sound wave is modeled with the equation y= 1/4 cos 2pi/3 theta. A. Find the period. Explain your method. B. Find the amplitude. Explain your method. C. What is the equation of the midline? What does is represent?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[y=\frac{ 1 }{ 4} \cos \frac{ 2\pi }{ 3 } \]theta

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2In the equation \[\large y=A \cos(Bx)\] the period T is given by \[\large T=\frac{2\pi}{B}\] and the amplitude is absolute value of A = A You need to plug the values into the above to find the values of the period and the amplitude.

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2In your equation \[\large B=\frac{2\pi}{3}\] and A = 1/4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So the period is T= 2pi/3 and the amplitude is 1/4?

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2The amplitude is 1/4. The period is given by \[\large T=\frac{2\pi}{\frac{2\pi}{3}}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So that's the period, the amplitude is 1/4. How do we find the midline cuz i have to show my work

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2\[\large T=\frac{2\pi}{\frac{2\pi}{3}}=\frac{2\pi}{1}\times\frac{3}{2\pi}=?\]

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2Correct, the period is 3 units. There is no yshift, therefore the equation of the midline is y = 0

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2The equation y = 0 is simply the xaxis.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How do we find the midline though? @kropot72

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2As I posted previously "There is no yshift, therefore the equation of the midline is y = 0" "The equation y = 0 is simply the xaxis."

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2dw:1437193916695:dw

kropot72
 one year ago
Best ResponseYou've already chosen the best response.2@EllenJaz17 Do you need more explanation?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No thank you so much, sorry i was writing everything down

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Once again thank you so much for your help, I gave you a medal

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yeah and this is supposed to be an Algebra class

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That's stupid i didn't learn that crap until last year in precal/trig
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