The balance in Ana's savings account may be modeled by the linear function y =50x + 2500, where x represents the number of months the have passed and y represents the account balance. Based on this function which of these is the best prediction of Ana's total savings after 3 years? A. $2,650
B. $3,700
C. $4,300
D. $7,650

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?