Yesenia needs to rent storage space for some of her belongings. She paid a one-time original storage fee of $45.00, and now pays $18.00 each month, m. Which answer would show an expression that represents the total amount Yesenia has paid after a certain number of months, m?

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?