Describe a way that you can remember the elements of the reflection matrices if you forget where the 1s, -1s, and 0s belong.

How do you solving the solution of each system using elimination?

Ten times the square of a non-zero number is eqaul to ninety times the number

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?