Identify where the function is increasing and where it is decreasing

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Acircus act has 3 times as many elephants as acrobats. jorge noticed that all together there were 56 legs in the circus ring. how many elephants were in the show?

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 : )