It is already rounded to the tens because there is no digit but 0 in the ones digit. I hope this helped.
Answer is in the attachment below. If you have any questions about the workings, just leave a comment below.
I don't know all of them but I can tell you that B and E are answers that you should check.
Answer: x = 0
Step-by-step explanation:
The hole in the graph (a discontinuity) exist where the function doesn't exist. Because anything divided by zero is undefined, then the function would not exit at 0, thus having a hole/discontinuity.