Let's Try Mores 1) A tree is situated on a hill and at a point P, 23 m down the hill from the tree, the angle subtended
by the tree is 18.5°. If the height of the tree is 36.5 m, at what angle is the hill inclined with the
horizontal?​

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?