Factorize both questions using ac method ill give brainlist

What is the smallest integer n such that n\sqrt{2} is greater than 20

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten 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?