The sum of -3x^2 or 3x^2 and 7x^2 is 10x^2

The length of each stair is 11 inches. what is the rise, r, for each stair? round to the nearest inch. 2 inches 7 inches 17 inches 24 inches

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

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?