The number of apples produced per acre of land depends on how densely the trees are planted. if n trees are planted in an acre of land, the function that can be used to estimate the total number of apples that will be produced is the quadratic function () a ( n ) . one farmer found that he would get a maximum yield of 202,500 apples when he planted 450 apple trees per acre. when he increased the trees per acre to 900, the trees produced no apples.