Suppose you received a job offer with a starting salary of $48,500 per year and a guaranteed raise of $1200 per year. Find the number of years ‘n’ until you will have earned a total of $321,000 since starting this job.

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.