An architect is designing a rectangular greenhouse. along one wall is a 7ft storage area and 5 sections for different kinds of plants. on the opposite wall is a 4 ft storage area and 6 sections for plants. all of the sections for plants are of equal length. what is the length of each wall?

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?