Answer:
7
Step-by-step explanation:
Reflection is a rigid transformation, so the side length does not change.
A'B' = 7
Angles 1 and 2 are supplementary angels because they form a line.
Angles 1 and 2 are adjacent angles because they share an interior ray and they have a common vertex.
f(-12) = -12(-12) + 100 = 144 + 100 = 244
42 divided by 3 is 14
42 over 3 is a whole number of 14