Please explain in detail how to solve this problem. I really want to understand how this works. If possible please type up the steps.

For each of the following functions from Z to Z, Determine if they are one-to-one, onto, neither, or both. Also, determine if they are invertible or not. For those that are invertible, provide the inverse. For those that are not invertible, explain why not. (a) f(n)=n3 (b) f(n)=n2+1 (c) f(n)=n/2