PLEASE HELP ME Prove that for any natural of n the value of the expression:
(3n+1)^2-(3n-1)^2 is divisible by 12

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships

Given right triangle abc, what is the value of tan(a)?

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.