4. (12 pts) Let f : [a,b] →R be a continuous function. Prove that there exists a point c in [a, b] such that

(Hint: Use the intermediate value theorem)
4. (12 pts) Let f : [a,b] →R be a continuous function. Prove that there exists a point c in [a, b] such that

(Hint: Use the intermediate value theorem)