Your answers:
10) (m+7)(m+8) 11) (b-10)(b+2)
12) (k-4)(k+10) 13) (n-9)(n-8)
14) (7r+3)(r-2) 15) (5a+6)(a+2)
Hope it helps
Answer:
x = 5
Step-by-step explanation:
Add three to 17 and your answer will be 20, then divide 20 and 4 and your answer is 5
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.
Because the left side sqrt is multiplied by 3 if it was just added it would be correct because it would cancel out and leave the 3’s. Since it’s multiplied it would change the value