#include <iostream>
#include <cmath>
using namespace std;

double addition (double x, double y){
    double z = x + y;
    return z;
}

double subtraction (double x, double y){
    double z = x - y;
    return z;
}

double square (double x){
    double z = x * x;
    return z;
}

double cube (double x){
    double z = x * x * x;
    return z;
}

double squareroot (double x){
    double z = sqrt (x);
    return z;
}

double squarecube (double x){
    double z = pow(x, 1.0/3.0);
    return z;
}

int main (){
    cout << "the first answer is: " << addition (4, 45.45) << endl;
    cout << "the second answer is: " << subtraction (4, 45.45) << endl;
    cout << "the third answer is: " << square (45.45) << endl;
    cout << "the forth answer is: " << cube (45.45) << endl;
    cout << "the fifth answer is: " << squareroot (45.45) << endl;
    cout << "the sixth answer is: " << squarecube (45.45);
}