He rocket that carried the curiosity rover to mars traveled at a speed of 21,000 miles per hour. what is this speed to the nearest mile per second? 6 miles per second 350 miles per second 1,260,000 miles per second 75,600,000 miles per second

Can someone me out here and the tell me the greatest common factor

Can you me find the missing length. i attached an image.

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.