Consider these methods: public static double f(double x) { return g(x) + Math.sqrt(h(x)); } public static double g(double x) { return 4 * h(x); } public static double h(double x) { return x * x + k(x) - 1; } public static double k(double x) { return 2 * (x + 1); } Without actually compiling and running a program, determine the results of the following method calls. a) double x1 = f(2);

b) double x2 = g(h(2));

c) double x3 = k(g(2) + h(2));

d) double x4 = f(0) + f(1) + f(2);

e) double x5 = f(-1) +

g(-1) + h(-1) + k(-1);