Which of the following relations is a function?

{(-4, 3), (-4, 2), (1, 9), (6, 7)}

{(-4, 3), (-2, 0), (2, 7), (3, 9)}

{(2, 1), (4, 2), (2, 3), (8, 4)}

{(0, 0), (0, 1), (2, 3), (4, 5)}

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

What is the value of x in the following equation? -3x-2=2x+8

Which expression gives you the distance between the points (5,1)and(9,-6)