I am so confused, can someone help

Well for A, move all terms that don't contain the valiable 'y' to the right side and solve.

Y = 9 − x/2

Or

Y = 9 −

For B, it's really similar to A, just isolate the variable 'h' by dividing each side by factors that don't contain the variable 'h', you get the answer,

H = 2a/b

Or

For C, it's exactly the same with B. Isolate the variable 'X' by dividing each side by factors that don't contain the variable 'X', the answer you have is,

X = y/4 - 3/4

Or

X = −

both equations and proportions are better.

9 x 8 divided by (5-3)=36