1. q: michael travels 172 miles in 4 hours. find the unit rate. 2. q: a man riding a motorbike travels a distance of 285 miles in 6 hours. what is the motorbike's speed in feet per minute? 3. q: an architect built a scale model of a shopping mall. on the model, a circular fountain is 21 inches tall and 17.5 inches in diameter. if the actual fountain is to be 6 feet tall, what will its diameter be?

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?