What are the variables in the expression x+8-y?

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Find the area between y=e^x and y=e^2x over [0,1]

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.