Letter d is 7 someone help me please

Which of the following is the formula for the sequence graphed below

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

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.