You are holding a movie party and want to make your own boxes for popcorn out of some old movie posters, which are 8.5 x 11 inches in size. You will construct the open-top boxes by cutting a square
out of each corner of the poster and folding up the sides. Being the generous host that you are, you want
to make boxes that hold maximum amount of popcorn

A) the scale factor is 1/4.
B) P'' = (-1, 0); Q'' = (0, -1); R'' = (2, -1).
C) No, they are not congruent.

The length of RQ is 8; after the dilation, the length of R'Q' is 2.  This means a scale factor of 2/8 = 1/4 was applied.

Reflecting this across the y-axis will negate the x-coordinate and leave the y-coordinate the same for each point.

The original triangle and the reflection are not congruent because the side lengths are not equal.