What two numbers multiply to 100, but add to -25?

What are the first 4 terms in the multiplication pattern given by the formula 2×4n

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?

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.