Answer ASAP please and thank you. Please give me the correct answer!! This is very important. I saw this question twice for they both had different answers. A. 108
B. 60
C. 72
D. 120

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

Factor and solve to find roots x squared -x - 90 =0

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?