(03.06 MC)
The volume of two spheres is shown:
Sphere A = 20 cubic inches
Sphere B 10 cubic inches
How many inches more is the radius of sphere A than the radius of sphere B? Round your answer to the nearest tenths. (Use I = 3.14)
Pleaasseee answer this I need it

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?