Klay and Aspyn love to play in the snow with their cousins Gage and Emma. They decide to have a contest to see which team can create the most snowballs in half an hour. Because Klay and Aspyn are younger, they are allowed a 4-snowball head start. Together they can make 2 snowballs every 5 minutes. Gage and Emma are older and can make 1 snowball every 2 minutes. Write a system of equations for this scenario.

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?