The Clayton Valley Charter High Football team recently accepted 20 athletes. The 20 athletes are invited to a "meet and greet" in the small gym. If each new athlete shakes hands with everyone else, then the number of handshakes that took place is

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

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

What number is 7 units left of -15?