pv=(g/m)rt
then I have to solve for
r=

m=

g/v=

please help I'm lost :( :confused:

here's a secret:

Whatever you do to one side, you must do to the other side.

So let's rearrange in terms of r:



we need to move the g, the t and the m over, let's move the g first. So we see that g is on the top, so we need to add a g on the bottom. divide both sides by g:



now we do the same with the t. divide both sides by t:



now we need to move the m, we see it's on the bottom so we need to multiply both sides by m:



now we simplify:





does that make sense?

can you do the rest? I'm happy to check them for you :)