which equations support the fact that rational numbers are closed under subtraction?

what are all the answers.

a. √8 − √8 = 0

b. 5√4 − √4 = 4√4

c. 4.5 − 0.5 = 4

d. 2√3 − √3 = √3

Consider an example of a deck of 52 cards: example set of 52 playing cards: 13 of each suit clubs, diamonds, hearts, and spades ace 2 3 4 5 6 7 8 9 10 jack queen king clubs diamonds hearts spades what is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.