Show that x=2 is a solution of the equation x^3-x-6=0

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

Pls! does anybody know a shortcut for answering these types of questions in the future?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?