How does a Double Number Line work? By the time Joaquin was 95 years old, his heightdecrease by 20%. If he was 6 feet tall when he was 30 years old, how much height did he lose?

1) Put the numbers onto the double number line
2) Write the % sentence that represents the question
3) Find the answer to the question (Show your work!)

_% of _ is _

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?