how to do this math problem?

Question

Solve the following for the indicated variable:

V=lwh for H

Answer 1

Be careful!  You wrote the formula for volume (product length, width and height--using lower case letters).

 

Then you ask to solve for H--a capital letter.

 

In general, h and H are used to represent different quantities, i.e. no Algebra student has permission to flip randomly between upper and lower case letters, because that's not precise and can be confusing.

 

NOW, to your specific question (solve for h).  You want to do something to the right side of your formula to eliminate the variables l and w.  Since they're multiplying your beloved h, then you must undo that multiplication, i.e. DIVIDE each side of the formula by the product lw.  

This gives you only h on the right side of the formula, and the left side is the desired answer, V/(lw).