In 2008 report shows that one million square miles of cropland in africa are on the decline. imagine that all the land is in the shape of a giant square. how long is one side of the square? a.100 miles b.100,000 miles c. 10,000 miles b 1,000 miles

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?