What is the suface area of a sphere with a diameter of 13

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

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.

Which number line represents the solution set for the inequality -1/2x> 24?