Design and implement program that implements the following 3 methods: - Method isValid(...) returns true if the sum of the width and height is greater than 30 boolean isValid(double width, double height){) - Method Area (...) returns the area of the rectangle if it is a valid rectangle .3B double Area (double width, double height){} Method Perimeter(...) returns the perimeter of the rectangle if it is a valid rectangle double Perimeter(double width, double height){} Always remember that in Java and C#, the methods must be public and static The main method should prompt the user to enter the width and height of a rectangle (double values) and uses the methods to print out a message followed by the area and perimeter if the rectangle is valid. Otherwise, it prints out only the message " This is an invalid rectangle." Note: that method isValid(...) is used to validate the input before attempting to compute the area and perimeter.

C++ please solve the equationnnnnn

Write the magic number program in C++ so that the user can guess at more than one magic number where the magic number is an integer between 1 and 20.  When the program is run, the user should be prompted if they would like to guess at a magic number and continue to be prompted as such after they have guessed a magic number correctly. A while loop is necessary for this capability,  The user should be given as many guesses as necessary for each number until they guess the number correctly.  A do-while loop must be implemented for this part of the program.  They should also be responded with a clue after each guess on whether the guess is too high or low.  The program should also make sure that if the user enters an invalid guess at the magic number (less than 1 or greater than 20), then the user should be prompted with an invalid guess message and not be penalized for a guess attempt. A while loop must be implemented for this part of the program.  After the user guesses the number…

Please in C++, thank you.