Can anybody help solve this?

What is the binomial expansion of (2x-3)^5

Which equation can be solved to find x the measure of jk in the apex

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.