Amazing Rental Car’s charges $15 a day plus $0.55 per mile. Carter’s Car Rentals charges $45 a day and $0.15 per mile. How many miles would you need to drive in order to spend the same amount of money with Amazing Rental Car’s than Carter’s Car Rentals?

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?