The life expectancy of a circulating coin is 30 years. The life expectancy of a circulating dollar bill is only 1/20 as long. Find the life expectancy of circulating paper money.

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?

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?

Explain how you can show five less than a number using algebraic expression