Select the sets that are not functions. B = {(1, 2), (2, 1), (3, 0), (4, -1)}
D = {(1, 1), (1, 2), (1, 3), (1, 4)}
A = {(1, 2), (2, 3), (3, 4), (4, 5)}
C = {(-1, 3), (0, 3), (1, 3), (2, 3)}
E = {(6, 2), (7, 3), (6, -1), (5, 4)}

Sets D, E

Step-by-step explanation:

Sets D and E both have repeated x-values , thus making them a relation not a function.

Sets D, and E, are the correct answer.

Step-by-step explanation:

the correct is answer is a 9-sided polygon!

irrational, then, just means all the numbers that aren't rational. every integer is a rational number, since each integer n can be written in the form n/1. however, numbers like 1/2, 45454737/2424242, and -3/7 are also rational, since they are fractions whose numerator and denominator are integers.

step-by-step explanation: