to find x you have to use SOHCAHTOA.
since you already have the opposite and you have to find the hypotenuse, you use the SOH part.
sin(25)= 6/x
you rearrange the equation to make:
x= 6/sin(25)
which is 14.1972095 and rounded up to 2dp is 14.20
so x would be 14.20