Hi guys I'm having difficulties approaching some of these problems, pointing me toward the right direction and checking my answers would be much appreciated

Question:

Rearrange each of the following equations making x the subject:

1.) w= y/ x + c

=

__x = yc-wc/w-c__
2.) y^3= (xz)^3

=

**x= sqroot y^3-z^3**
3.) zx= yx + w

=

__ x= w/z-y __
4.) v= 8^3/2......No idea about this one

In the likely event that I've got all/any wrong I can provide the steps which got me into this mess on request.....thanks in advance guys