The expression - 16r^2 + 20t + 100 represents the height of an object t seconds after it is dropped from a height of 100 feet. Why is this expression a trinomial? What is its degree?

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?