If you mean: a= 21w + 21h + 2wh
then
you subtract 21w and 21h from both side.
here will look like: a - 21w - 21h= 2wh
then divide 2w from each side
look like this: a - 21w - 21h / 2w = 2w/h
answer is a - 21w - 21h / 2w = h
Answer:
im sorry if not but i think its 7.24
Step-by-step explanation:
C