Traveling Waves Questions

The wave described by $y=0.25\sin (10\pi x-2\pi t)$, where $x$ and $y$ are in meters and $t$ in seconds, is a wave travelling along the:

A wave in a string has an amplitude of $2\text{cm}$. The wave travels in the $+ve$ direction of $x$ axis with a speed of $128\text{m/sec}$ and it is noted that $5$ complete waves fit in $4\text{m}$ length of the string. The equation describing the wave is: