## anonymous one year ago a sound wave is modeled with the equation y = 1/4 cos 2(pi)/3 (then some weird zero with a line through it)... find the period and amplitude ...

1. Loser66

I think you miss x after 2pi/3, right?

2. anonymous

no there is a weird circle after it

3. anonymous

u missed x after 2pi/3 right??

4. anonymous

yea u did

5. anonymous

there isn't an x on it, but I guess include the x if needed to solve it :/ i just want to know how to answer it

6. anonymous

oh im sorry im only 12

7. Loser66

ok, if you don't have x, then it is a point on a graph, no amplitude, no period.

8. Loser66

Suppose there is x there. I meant the function is $$y =(1/4) cos (2\pi/3) x$$

9. Loser66

amplitude is 1/4

10. anonymous

yes what he said im onlt 12

11. kropot72

Is this the equation? $\large \frac{1}{4}\cos \frac{2 \pi}{3} \theta$

12. anonymous

yeah

13. kropot72

The period is given by: $\large T=\frac{2 \pi}{\frac{2 \pi}{3}}=3$

14. anonymous

thanks!

15. kropot72

You're welcome :)