Area of composite shapes!!

When a formula is solved for a particular variable, several different equivalent forms may be possible. if we solved a=1/2bh for h, one possible correct answer is h=2a/b . which one of the following is not equivalent to this? a. h= 2(a/b) b. h= 2a(1/b) c. h= a/1/2b d. h= 1/2a/b

Will give brainliest if you answer question correct

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?