Gavin works two part-time jobs to pay for college. He works 8 hours each week tutoring and 10 hours each week in the dining hall. He gets paid the same hourly wage at each job. His parents also provide Gavin $50 per week for expenses. Gavin writes this expression, 18w + 50, where w represents his hourly wage, to represent his total weekly income.

Write another expression, equivalent to Gavin’s

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?