Hey there QueenDobby!
The answer should be C) h = 2A/a+b
To solve for h from the given equation A = [tex] \frac{1}{2} [/tex] h (a+b) we need to isolate h and to do so, we need to start from the parenthesis according to PEMDAS.
So, since [tex] \frac{1}{2} [/tex]h it's being multiplied by (a+b), we need to divide (a+b) from both sides and we are left with [tex] \frac{A}{a+b} [/tex] = [tex] \frac{1}{2} [/tex] h. Now, to isolate h, you can see that h is being multiplied by [tex] \frac{1}{2} [/tex] so what we need to do is to divide [tex] \frac{1}{2} [/tex] from both sides, and when you are dividing fractions, you multiply it by the reciprocal of the fraction.
Example [tex] \frac{a}{b} [/tex] goes to [tex] \frac{b}{a} [/tex]
So, the reciprocal leaves us with [tex] \frac{2}{1} [/tex] which is the same as 2. So we multiply both sides by 2 and we are left with h = [tex] \frac{2A}{a+b} [/tex]
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