Please help me please will give brainliest to anyone who is good

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Pls what is the relative minimum of the function? enter your answer in the box

Determine where, if anywhere, the function f(x)=x^3+9x^2−48x+2 is not changing.