Hyun is comparing two numbers. he knows the larger number is twice the value of 4 more than the smaller number, x. he also knows their difference is 11. which equation can he use to find the value of the smaller number, x?

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.