Help me plz i need help i need help right now right now

Hurry which expression is equivalent to 3√x^5y?

Find the maximum value of p= 4x + 5y subject to the following constraints :

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.