Given that U ={1,2,3,4,5,6}, find the complement of the set A= {2,3,5}

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

Ineed if you could explain and give me the answer you! this needs done

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2