Is it true that a continuous function that is never zero on an interval never changes sign on that interval? give reasons for your answer?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Which of the functions below could have created this graph?

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )