Help with Algebra II. Solve For X, and Solve Each Formula?

Question

Okay, I really need help with these problems on my Algebra homework.

Directions: Solve Each Formula for the indicated variable.
V=pi/3 r^2h, for h

Directions: Solver for x. State any restrictions on the variables.
a(x + c) = b(x - c)

I have another problem that goes under the first set of directions that I am stuck on.

S = (cursive L)w + wh + (cursive L)h, for w.

Any help would be appreciated. I would really appreciate if you add how to do the problems also.

Answer 1

V=pi/3 r^2h, for h
3V= pir^2h
h = 3V/(pir^2)

a(x + c) = b(x - c)
ax+ac = bx -bc
ax-bx = -ac-bc
x(a-b) = -c(a+b)
x = -(a+b)/(a-b)

S = (cursive L)w + wh + (cursive L)h, for w.
S-Lh = (L+w)h
(S-Lh)/(L+w) = h