PLZZZ HELP ME ASAP [In this question, take
=3.14]

a) A hollow cylinder standing on a horizontal circular base of radius 10 cm
contains water to a depth of 12 cm.

Find the volume of the water.=

b) A solid sphere has radius of 5 cm. Find the volume of the sphere =

c) If the sphere is placed in the cylinder of water, find the increase in the depth of the water=

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?