It is given that 1 ounce of graphene covers 7 football fields.
Therefore, 48 ounces can cover
7×48=336 football fields.
If each football field has an area of
1 acres, then 336 football fields have a total area of
36×=448 acres.
Therefore, of the choices given, 450 acres is closest to the number of acres 48 ounces of graphene could cover.
Choice A is incorrect and may be the result of dividing, instead of multiplying, the number of football fields by
1.
Choice B is incorrect and may be the result of finding the number of football fields, not the number of acres, that can be covered by 48 ounces of graphene.
Choice D is incorrect and may be the result of setting up the expression
and then finding only the numerator of the fraction.