26. analyze relationships luke and lena's parents allow them to borrow
against their allowances. the inequality -$11.50 < -$10.75 compares the
current balances they have with their parents. luke has a greater debt with
his parents than lena has. how much does luke owe his parents? explain.

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?