Question 15 unsaved which biconditional is not a good definition? question 15 options: a whole number is odd if and only if the number is not divisible by 2. a ray is a bisector of an angle if and only if it splits the angle into two angles. an angle is straight if and only if its measure is 180. a whole number is even if and only if it is divisible by 2.

We see that the second definition is not a good definition. We want both parts to have the same truth value, but we see that we can have two angles created by a ray that are not equal. That means the antecedent is false but the consequence is true, which means it's not an iff statement, and a bad definition in this context.

answer: i guess 5 units?

step-by-step explanation: