Your roommate is desperate to avoid bad grades. he studies long into the night. when you ask your roommate about this behavior, he tells you that the sensation of going to bed exhausted from studying feels good to him because it means he will not fail his quizzes. your roommate is a believer in?

Katie and her father are looking at the pipes around their house. they find that some of the pipes have rust on them, making them look and feel different than normal pipes. what kind of change have the rusted pipes gone through? a. a physical change b. a vibration change c. a chemical change d. a temperature change