Is the relation a function? Why or why not? {(3, –1), (3, 0), (–3, 4), (3, 8)}

Yes; only one range value exists for each domain value.
No; three range values exist for domain value 3.
No; the relation passes the vertical-line test.
Yes; three range values exist for domain value 3.

B

Step-by-step explanation:

An x can't have 2 y values and it still be a function. If it fails the vertical line test, it is not a function.

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.