Carlos earns $11 per hour at his job. Let a represent the number of hours he worked in May. Let y represent the number of hours he worked in June. Which expressions represent the amount of money, in dollars, Carlos earned in May and June? Select all correct answers 11ry 22.ry 112 + y) 117 + 1ly 0 (x + y) + 11

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?