Which of the following is not a function

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

Ten times the square of a non-zero number is eqaul to ninety times the number

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?