Posted by Josh on .
Solve each formula for N
r/n + 2 = p
t=100 (n+3)
pv/nr = T
8a + 2n + 6b

Math 
PsyDAG,
Get rid of the parenthesis.
t = 100n + 300
Subtract 100n and t from both sides.
100n = 300  t
Divide both sides by 100.
n = .01t  3
This should help you with the other equations.
The last example is not an equation and therefore cannot be solved for n.