Aprofessor must randomly select 4 students to participate in a mock debate. there are 15 students in his class. in how many different ways can these students be selected, if the order of the selection does not match

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers