Answer:
the correct answer is b.
Step-by-step explanation:
it is b because if you plug in -7, two of the x-values will have -7 making the x-values the same and in order to be a function all x-values have to be different.
10.7(4.2)+15.9 equals 60.84
51.25+43.85+14 equals 109.1
from the pythagorean theorem:
