Look at the box-and-whisker plot. what is the measure of the second quartile (q2)? a)43.5 b)47.5 c)50.0 d)51.0

i would say B

when it says "the measure", it's refering to where the second quartile is beginning

i really dont know

step-by-step explanation:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value