An apartment complex charges a refundable security deposit when renting an apartment. The deposit is $350 less than the monthly rent. If Charlene paid a total of $950 for her first month’s rent and security deposit, how much is her monthly rent? How much is the security deposit?(Hint: You have 2 unknowns. Pick a variable to represent the one you know the least about. Use that variable and the other information to represent the second unknown.)

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?