Help please :) with question 4 and 5 don’t mind the selected one i don’t know the answer to that one either

On a architect's drawing of a house, 1 inche representa 1.5

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute

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?