Which relation is a function?
question 3 options:

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

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

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

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

The correct answer would be C.

Step-by-step explanation:

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

A function doesn't let its x-coordinates repeat.  In the first option, 2 repeats.  In the second option, 1 repeats.  In the 4th option, 1 repeats.

Hope this helps! :)

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

idk

step-by-step explanation: