What is a parent function and how do you find the parent function

What is the radical expression that is equivalent to the expression 27 1 over 5?

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

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?