Arthur tells you that he is thinking of an irrational number between 4 and 5, and he wants you to guess what it is.

one possibility you could guess is

sqrt 20
4.5
sqrt 27
sqrt 9

Step-by-step explanation:

We know it can't be 4.5 or sqrt9 because an irrational number is neverending, and 4.5 and 9 end. It's also not sqrt27 because that's above 5, so our answer is sqrt20, which is equal to 2*sqrt5. If you guess that sqrt5 is above 2 (since sqrt4 is 2) but below 3 since sqrt9 is equal to 3, and you know it's closer to 2, it's likely between 4 and 5 because 2*2=4

b and c

step-by-step explanation: