Help pls (8grade math)

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?