In Exercises 1-4, use a graphing utility to graph the function. Use the zero or root feature

Question:

In Exercises 1-4, use a graphing utility to graph the function. Use the zero or root feature to approximate the real zeros of the function. Then determine whether the multiplicity of each zero is even or odd.
1. f (x) = x3 - 16x
2. f (x) = 1/4x4 - 2x2
3. g(x) = 1/5(x + 1)2(x − 3)(2x − 9)
4. h(x) = 1/5(x + 2)2(3x − 5)2