Which ordered pair (x, y) makes this relation a function?

{(2,3), (–2,5), (4,4), (-4,5), (x, y)}

A. (-4, -1)
B. (-1,-1)
C. (-2,-1)
D. (2, -1)

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.