In a dresser are four blue shirts, five red shirts, and seven black shirts. a) What is the probability of randomly selecting a red shirt? b) What is the probability that a randomly selected shirt is not black?

The 7th grade has collected $200 for a field trip that would cost $600. the teachers decided to ask $50 from additional students to cover the cost. how mny students must pay to cover the cost ? a 16studentsb 80studentsc 160studentsd 8students show work