Logan solved the system of equations using the elimination method. 3x – 12y = 9 -2x – 2y = -6 His solution was (3,0). Is he correct? If yes, describe the steps he took to find the solution. If no, explain what he did incorrectly and what he needs to do to correct his mistake.

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.