The stream of water from a fountain follows a parabolic path. The stream reaches a maximum height of 5 feet, represented by a vertex of (3,5), and lands 6 feet from the water jet, represented by (6,0). Write a function in vertex form that models the path of the stream.

f(x)=

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?