Please help!! this is for my math!

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

Find the domain and range of the following function f(x) = 51x - 21+ 4

Someone which statements are true? check all that apply.