hey guys, i need some help on this question, plz, if you don't know the answer it;s ok but if u do plz help me. I will be giving 10 pts. :) thank you very much!

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 values of y: 3y^3(y^2+ 2/3y)=0

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15