Several functions represent different saving accounts plans. Which functions are nonlinear? A. y = 5.50(1.02)x
B. y = 5.50x + 7
C. y = 5.50(x)2
D. y = 7.25x
E. y = 7.25 + x²

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.