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:

pv=\frac{grt}{m}

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:

\frac{pv}{g}=\frac{grt}{gm}

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

\frac{pv}{gt}=\frac{grt}{gmt}

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

\frac{pvm}{gt}=\frac{grtm}{gmt}

now we simplify:

\frac{pvm}{gt}=\frac{g}{g}\frac{t}{t}\frac{m}{m}r= r

r=\frac{pvm}{gt}

does that make sense?

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