Functions can take any number of parameters. Separate with commas: int calculate(int x, int y, int z). Each gets its own type and name. Pass arguments in the same order. Types don't have to match.
Mix integers, doubles, strings: void display(string name, int age). Just match types and order when calling. Keep the count reasonable. Ten parameters means your function does too much.
Three or four is common. Consider structs for related data.