Answer:
7
Step-by-step explanation: 6 + 5 + 8 + 5 + 9 + 6 + 7 + 5 + 12 = 63 so now u just divide that by 9

You are taking two times a number, which is defined as x. That is equivalent to 2x. Then, you are adding three more to that product.
Answer:
a
Step-by-step explanation:
I'm assuming this is multiple choice and you forgot to post the answers. I'll take a guess and say it probably looks something like this:

Because you can't take the square root of a negative number without getting an imaginary result, resulting in the function having a closed domain limit.