Please help! It’s due today! In triangle PQR, a line parallel to QR intersects PQ and PR at K and M, respectively. If triangle PQR = 144 square units and QRMK = 119 square units, what is the numerical value of (mk)/(qr)?

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?