16. Farmer Jim plants apple trees in a square pattern. To protect the apple trees against wind, he plants conifers or pine trees all around the orchard. The diagram shows the pattern of plantings for any number of rows (n) of apple trees. How many apple and conifers or pine trees are needed for n = . 5? n = 1 X X X n = 2 n = 3 n = 4 X X X X X X X X X X X X X X X X X X X X X X X X • • X ✗• • X X • • X X X X X X X X X . • X X X X X X XX X • X × • X x = conifer tree X X X X X X X X X • • X X • X X • X • = apple tree X X X X X X X X X