XY is tangent to circle Z at point Y. Xw is tangent to circle Z at point W. If XY = 12 units, what is the length of the radius of circle Z to the nearest tenth of a unit? ​

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