For each graph in Exercises 25-30, list all x-values for which the function is not differentiable. 25. YA XO X1 X2 X3 X4 X5 *6 XT 26. YA XO X1 X, X3 X4 X5 X6 XR X\f29. X4 X5 X1 X3 30. AM X7 XB Xo X10 XO X1 X2 X3 X4