Divide both sides by 2
a-c=2a
minus a fromboth sides
-c=a
I don't know what the list of equations are, but if you take 12x2 you get 28 and 48-28=20 and the 20 is divided by two sides, so the width is 10ft <span />
Answer:
I would go for D. scientific method
79200 feet in 15 miles and 1 hour there is 60 seconds