Here are the answers to your questions:
Question #1: At which point on the roller coaster graph is potential energy the highest?
Response: At the top of the tallest hill
Question #2: Which of the following increases as the roller coaster speeds up?
Response: Kinetic Energy
Question #3: What happens to the roller coaster’s potential energy as it climbs up the smaller hill?
Response: It increases
Question #4: At the bottom of the hill, the roller coaster’s kinetic energy is:
Response: At its maximum
Question #5: Which factor does NOT affect the roller coaster’s potential energy?
Response: Its speed
Feel free to ask if you have more questions or need further clarification!