Pyramid A is a square pyramid with a base side length of 18 inches and a height of 9 inches. pyramid B has a volume of 3136 cubic inches. How many times bigger is the volume of pyramid B than Pyramid A? Give your answer as a percentage. Provide an explanation improve for your answer to receive full credit.

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?