3a-28-7a=10a I don’t understand it

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

M. xyz =radians. covert this radian measure to its equivalent measure in degrees.

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?