A is irrational but b is rational. This is because for b you can work out both square root of 64 (8) and square root of 4 (2). But for a, the square root of 5 is an irrational number :)
Answer: c
Step-by-step explanation:
Because Giannis is better
-78
Step-by-step explanation:
(7-8)(78)
(-1)(78)=-78