The difference of the squares of two consecutive odd integers is 24. find the integers

Do you mind if you guys me with this question i’m on number 8

Which is the graph of this function 3 square root of x plus one if

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?