Scuba diving, Elisa descends at a rate of 5 1 2 feet per minute. If she starts at the water's surface and descends for 5 minutes, how far will she be from a dock that is 5 feet above the water's surface? Enter your answer as a decimal.

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.