The tension in a string is $13\mathrm{.}2$ N $,$ and its linear density is $0\mathrm{.}990k\frac{g}{m}.$ A wave on the string travels toward the $-$x direction; it has an amplitude of $3\mathrm{.}85$ cm and a frequency of $12\mathrm{.}7$ Hz $.$ What are the $($a$)$ speed and $($b$)$ wavelength $($in terms of m $)$ of the wave? $($c$)$ Write down a mathematical expression $($like Equation $16\mathrm{.}3$ or $16\mathrm{.}4)$ for the wave, substituting numbers for the variables $A,f,$ and $.$

$($a$)$ Number

Units

$($b$)$ Number $$ Units

$($c$)y=*$

$1$

$$

$$

i $$

$($:${?}^{**}x$