I need a grade 10 trig review on soh cah toa and inverting it\and also non right triangles thanks

and what do people mean by theta like sin(theta)

secondly if I'm told torearrange an equation to find x does the back slash in s=x/t mean divide or what

theta is used to denote an unknown angle.

yes, backslash is normally meant to mean divide.

Have a look here for a quick overview of trig: Trigonometry - Wikipedia, the free encyclopedia