6x +3 = 6x -20 - x equations with variables

What could explain what happened when the time was equal to 120 minutes

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?

32a³b² 8ab² simplify the following expression.