Answer:
4
Step-by-step explanation:
4 is the greatest commen factor of 20 and 84
4 x 5 = 20
4 x 21 = 84
Choice A is correct
BC=DC
the two triangles share one angel C
the two triangles each have a right angle
so they are congruent according to Angle-Side_Side Theorem
6 + 2 = 12
When 2 = 3
Change the equation to: 6 + 3
So,
6 + 3 = 9
You're answer is 9
