Which best represents the solution set of all real numbers

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

Ineed in figuring out this problem.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83