Fill in wats missing?

Which graph shows a function with a range of all real numbers greater than or equal to -1

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

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders