Which of the following expressions represents a function?

a.{(1, 2), (4, –2), (8, 3), (9, –3)}
b. y2 = 16 − x2
c.2x2 + y2 = 5
d. x = 7

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

The equation ip| = 2 represents the total number of points that can be earned or lost during one turn of a game. which best describes how many points can be earned or lost during one turn?

Given: q = 7m + 3n, r = 11 - 2m, s = n + 5, and t = -m - 3n + 8. simplify r - [s + t]. m - 2n - 2 -m + 2n - 2 3m - 4n + 14 -3m - 4n + 14 (not this one)