The number of apples produced by each tree in an apple orchard depends on how densely the trees are planted. If only one tree were planted in a given acre, it would be expected to produce 650 apples. For each additional tree added to an acre, the number of apples produced by each tree would be 5 fewer. Let n represent the number of trees planted per acre. (a) Find a function that represents the total number of apples produced per acre of land as a function of n. (b) How many trees should be planted per acre to obtain the maximum yield of apples?