The number of windows on each floor form an arithmetic sequence; 124 windows on the first floor, 116 windows on the second floor. Derive the explicit formula from the given information and find how many windows are on the tenth floor.

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The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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?