Adam scored x points. imran scored 3 points fewer than adam . shakeel scored twice as many points as imran. together they scored 39 write down in terms of x an expression for the number of points scored by shakeel.

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?