Which of the following is equivalent to the radical expression below when x > 0?

If you answer right ill give brainliest, : )

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 solution of this system of equation -7x+y=-20 9x-3y=36