A rectangular yard is x feet wide. The yard is 4 feet longer than it is wide. The perimeter P
of the yard is given by the equation P = 4x + 8.
If the perimeter of the yard is 84 feet, how long
is the yard?
A. 19 feet
B. 23 feet
C.24 feet
D.28 feet

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?