B. a reflection across the x-axis
The given triangle has vertices
The image triangle has vertices
We can see that the mapping for the above transformation is
This is the mapping for reflection across the x-axis.
The correct choice is B.
1 Expert Answer
Let x and y be the two numbers. Then by assumptions we have x+y=30 and x-y=20. Hence, y=x-20 and by plugging this into the first equation we obtain x+x-20=30 or 2x=50 or x=25 and y=5
So, divide 30 by 2 . That gives you 15 for x, 15 for y. Now, you have difference of six, divide by two, that equals 3.
the answer is 2
a real number is a value of a continuous quantity that can represent a distance along a line