Ellen wants to make curtains for her kitchen. Each panel takes 67 - inches of material. How many 4
inches of material will she need if she has three windows and each needs two panels?
3 windows with 2 panels = 6 panels

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?