Answer: Reflection about x-axis
Step-by-step explanation:
Given
Initially, vertices are 
After reflection they become 
It is clear that the x coordinate remains unchanged and the y coordinate changes its sign. It occurs when reflection is done about the x-axis.
For example, when (a,b) is reflected about the x-axis, it becomes (a,-b).
So, here reflection is being done about the x-axis.
You can solve any further
Answer:
the second one is the answer
The mode is 7.9 according to my calculations. You find the number that appears the most in the set. If I am right, brainliest answer and thanks?