Gravity on the moon is much weaker than on earth. the expression below can be used to approximate the time in seconds it takes for an object to reach the surface of the moon, when dropped from a height of h meters. to the nearest hundredth of a second, how long would it take for an object dropped from a height of 50 meters to land on the moon? (enter only the number, such as 3.25 without units.)
h(square root)0.82

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?