Acamera store developed 2100 rolls of film in one month. customers wanted double prints from 1500 of these rolls. what is the ratio of roll smith double prints to rolls devoloped ?

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?

Solve the equation 1. x-3/4=2 4/52. -1/3x-11= -20 3. -12+5/7x= -19

Me find the answer and explain the process to find the answer of the problem appreciate it : )