Classify each number below as a rational number or an irrational number. (a) Is 4π rational or irrational?

Classify each number below as a rational number or an irrational number.
(a) Is 4π rational or irrational?
(b) Is -√49 rational or irrational?
(c) Is 8/17 rational or irrational?
(d) Is 52.6̅ rational or irrational?
(e) Is -√19 rational or irrational?