Portia is planning a long road trip. She needs to travel a total of 3,700 miles. Portia plans to drive the same number of miles, m, each day and plans to complete the trip in 20 days. Write an equation that can be used to determine how many miles, m, Portia will need to drive each day: help

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?