Abox contains ten balls, numbered 1 through 10. marisha reaches in without looking and draws a ball. then penney draws a ball without looking. find each probability. a) p( the sum of the numbers is even) b) p( the sum of the numbers is odd) c) p( the sum of the numbers is 7) d) p( the sum of the numbers is 20) e) p( the sum of the numbers is prime) f) p( the sum of the numbers is greater than 8)

2a+7+4ahow many terms? how many variables? any like terms? yes noif yes, which ones? what are the coefficients? any constants? yes noif yes, which ones? simplify the expression by combining like terms and constants: how many terms now?

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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?