C. obsessive-compulsive disorder
She feels the need to do that ritual of ringing the doorbell 10 times no matter what, which means she has ocd.
Answer: A girl who dresses and acts like her mother.
Well first you would add 5 to both sides making it look like 3x -5(+5)=10 + 5 you would do this to get X on its own and so that makes the new equation 3x=15 and then you devide both sides by 3. (3x÷3=15÷3). which equals x=5
Chlamydia is by far the most common today.