Aprogram on television ran 30 minutes. the program ran seven minutes longer than three times the length of the commercials. use the guess and check method to find the number of minutes the commercials ran during the program. a. 12.3 b. 3.7 c. 7.7 d. 22.3

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?