CalculateBatrakova/ConsoleApp1/Calculate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    public class Calculate
    {
        public static double Sum(double x,double y)
        {
            return x + y;
        }

        public static double Subtraction(double x, double y)
        {
            return x - y;
        }

        public static double Multiplication(double x, double y)
        {
            return x * y;
        }

        public static double Division(double x, double y)
        {
            return x / y;
        }

        public static double Exponentiation(double x, double y)
        {
            double result = x;
            for(int i=1; i<= y;i++)
            {
                result = result * x;
            }
            return result;
        }
    }
}