An apple farm yields an average of 41 bushels of apples per tree when 19 trees are planted on an acre of ground. Each time 1 more tree is planted per acre, the yield decreases by 1 bushel (bu) per tree as a result of crowding. How many trees should be planted on an acre in order to get the highest yield? In order to get the highestyvoid, trees should be planted on an acro