Which is the simplified form of the equation 8p + 4 = -p + 7 + 2p + 3p ?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

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?