The area of triangle ADE is probably half of triangle ABC, so the perimeter would be 15 units, and the area would be 45 units squared.
There are 16 oz per 1 lb. multiply 10 by 16 (to convert your lbs into oz) =160. Then divide that by 8 (to figure out how many 8oz bags it would fill) =20 bags. Or since each bag you want to fill is half a lb multiply the number of lbs by 2, which would also give you 20 :)
The answer you are looking for is 11x-4
