Can someone me with this question? ? it’s really hard and once you understand it, can you give me an explanation? so ( number: 7)

Three times the sum of a number and seven is negative thirty-six. what is the number?

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y

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