Help with Physics please!?

Question

The drawing shows two graphs that represent a transverse wave on a string. The wave is moving in the +x direction. Using the information contained in these graphs, write the mathematical expression (similar to Equation 16.3 or 16.4) for the wave. (Answer in terms of t and x. Assume standard units.)


http://img85.imageshack.us/img85/8610/1626altlo7.gif

answer will be in the ( y= ) format

Answer 1

The first wave is an inverted sine wave with period .040 and amplitude .010, so the expression is

y = -.010 sin ((.2 pi / .040 ) * t)

Similarly, the second is

y = +.010 sin ((2 pi / .30) * t )