Reflecting across the x axis maintains the same x coordinate, but changes the sign of the y coordinate.
So, the transformation is

I believe the statement that is always true is
A. Vertical angles are congruent
Answer:
Width = 9 inches , length = 12 inches.
Step-by-step explanation:
Let the width = x inches, then its length x+3 inches.
Perimeter = 2x + 2(x + 3) inches so
2x + 2(x + 3) = 42
4x + 6 = 42
4x = 36
x = 36/4 = 9
So the width is 9 in and length = 9 + 3 = 12 inches.
You are correct.
To find the percentage of something, cross multiply its ratio with x/100. X is the percentage we need to find.
816/850 = x/100
816 * 100 = 850 * x
81600 = 850x
Now time to isolate x.
81600/850 = 850x/850
96 = x
The answer is 96%.