(FREE POINTS) I'm bored what should I do?

What could explain what happened when the time was equal to 120 minutes

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?

Marking brainliest rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.