You would have to set you problem up like
x 40
____=_____
720 100
you would multiply 40 by 720 then you would divide 28,800 by 100 your answer will be 288.
D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
You need to expand the brackets eg.
(w-9)8 basically means 8 x (w-9) = 8w-72
IGH because the angles line up
