Please do number 19 for me.

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?

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket

16x^2-16x=5 solve the equation by completing the square