A graph of a function f is given. Use the graph to find the indicated values. The x y-coordinate plane is given. The curve labeled f begins at the point (0, 6), goes down and right, passes through the point (2, 5), passes through the point (4, 4), goes down and right, passes through the point (5, 3), passes through the point (6, 2), passes through the point (7, 1), and ends at the point (8, 0). (a) f1(1) (b) f1(5) (c) f1(6)