I have no idea how to solve this help

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

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

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?