Q1: Write a C++ program to calculate the volume of a pyramid. Users are required to enter the dimensions of the pyramid, including its height, width, and length. If you enter negative values for length, width, and height, you will receive a display message indicating incorrect input. Afterward, after verifying the validity of these variables, the pyramid's volume is calculated and displayed. Recall that .

X609: Magic Date A magic date is one when written in the following format, the month times the date equals the year e.g. 6/10/60. Write code that figures out if a user entered date is a magic date. The dates must be between 1 - 31, inclusive and the months between 1 - 12, inclusive. Let the user know whether they entered a magic date. If the input parameters are not valid, return false. Examples: magicDate(6, 10, 60) -> true magicDate(50, 12, 600) –> false

C#: Please help

Chapter 5. PC #2. Retail Price Calculator (page 312) Write a program that asks the user to enter an item’s wholesale cost and its markup percentage. It should then display the item’s retail price. For example: • If an item’s wholesale cost is 5.00 and its markup percentage is 100 percent, then the item’s retail price is 10.00. • If an item’s wholesale cost is 5.00 and its markup percentage is 50 percent, then the item’s retail price is 7.50. The program should have a method named calculateRetail that receives the wholesale cost and the markup percentage as arguments, and returns the retail price of the item. Class name: RetailPriceCalculator Here is a working code but please fix it so it will in Hypergrade which as all the test casses. I DO NOT NEED THANK YOU IN THE PROGRAM. IT HAS TO PASS ALL THE TEST CASSES PLEASE. THANK YOU!!!!!: import java.util.*;class RetailPriceCalculator{ // creating a method public static double calculateRetail(double wholesale,double...