Need help ASAP I will give thanks

Ascatterplot is produced to compare the size of a school building to the number of students at that school who play an instrument. there are 12 data points, each representing a different school. the points are widely dispersed on the scatterplot without a pattern of grouping. which statement could be true

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?