Waves on a string are described by the following general equation

y$($x$,$t$)=$Acos$($kx$$t$).$

A transverse wave on a string is traveling in the $+$xx direction with a wave speed of $8\mathrm{.}75$ m$/$s $,$ an amplitude of $8\mathrm{.}00102$ m $,$ and a wavelength of $0\mathrm{.}490$ m $.$ At time t$=0,$ the x$=0$ end of the string has its maximum upward displacement. Find the transverse displacement y of a particle at x $=1\mathrm{.}56$ m and t $=0\mathrm{.}150$ s $.$

Calculate the frequency ff of the wave on the string.

Express your answer in hertz.