He makes the following table to prove that the alternate interior angles are equal:
Statement Justification
angle 2 = angle 6?
angle 2 = angle 4 Vertical angles are congruent.
transitive property of equality,
angle 2 = angle 6,
angle 4 = angle 6
angle 2 = angle 4,
therefore angle 4 = angle 6
Which is the missing justification?

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !