There are 3x-2 trees planted in each row of a rectangular parcel of land. if there are a total of 24x-16 trees planted in the parcel, how many rows of trees are there in the parcel?

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?