The augmented matrix below represents a system of equations.

Which matrix results from the operation R1<->R2

Place the following steps in order to complete the square and solve the quadratic equation,

If my mom gets $13.05 an hour, and she works from 3: 30 to 10: 45 in the morning, how much money does my mom make?

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?