A class has 24 students, 10 of which are sophomores, and 14 juniors. One student is asked to write her answer to question #1 on the board, then a second student is sent on an errand to the main office. What is the probability that the two selected students are both sophomores? _100/576 _90/552
_ 123/552
_144/576​

Runners run around the school's football field. the cross country coach determines that the width of the field is seventy yards shorter than the length. part a write an expression that represents the perimeter of the football field. let x represent the length of the football field. include parentheses in your expression. next, write an equivalent expression that does not include parentheses. what property or properties did you use to simplify? explain. part b the cross country coach later determines that the length of the football field is 120 yards. all students must run five laps. using your answer from part a, determine the actual number of yards that each athlete must run in the tryouts. in order to make the team, students must complete the laps in 6 minutes. how quickly must they run each lap?