What is the answer to just part a?

5. {14/15 Points] DETAILS PREVIOUS ANSWERS MY NOTES Consider the function f(x) = X29- (a) Find the domain off. (Enter your answer using interval notation.) (700,73),(73,3),(3,oo) X (b) Find the intervals on which fis increasing. (Enter your answer as a comma-separated list of intervals.) (700,73),(73,0) \\I Find the intervals on which fis decreasing. (Enter your answer as a commaseparated list of intervals.) (no\\ {DNA