sergei uses 4 cups of ice cream to make 3 milk shakes. how many cups of ice cream does he need to make 5 milk shakes?

a. 1 1/3 cups of ice cream
b. 4 cups of ice cream
c. 5 cups of ice cream
d. 6 2/3 cups of ice cream

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?