Can someone help me ill give brain thingy

What kinds of numbers make up the set of numbers called the real numbers? give examples when you explain a number type. there are a limited set of types of numbers, but an unlimited number of examples of these numbers.

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

How to simply and write the answer n a whole number