Answer:
a
Step-by-step explanation:
Greatest Common Factor is the "biggest" number that each have in common
20 a bbb + 16 aa b + a
the only thing all three have in commom is the "a"
The theorem proving the triangles' congruence is Angle-side-angle (ASA) and the angle corresponding to Q is S; therefore, the answer is B.
QPR = STR; ASA
Percent of change will always be positive because the change is an absolute value. As we know, absolute value is always a positive value because you don't pay attention to the direction, only the distance is important.