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1 is the 3rd option

2 is the last option

First Question: v/lw = h

Second Question: x - y = z

Step-by-step explanation:

First Question:  Since you're solving for h, you need to get it by itself.  To do so, you need to get l and w on the other side of the equation.  To get them on the other side, you need to do the opposite sign. ( for example the opposite sign of addition of subtraction.)  Since you're multiplying lwh, you divide l and w off of h.

V = lwh/lw

v/lw = lwh/lw

v/lw = h

Second Equation:  It's the same thing as the last equation, but with addition and subtracting.  Because you need to get z by itself, you subtract y off our the right side and onto the left.

x = y + z

x =+ y - y +z

x - y = +y - y + z

x - y = z or z = x - y