1. Write a PHP program that calculates the sum, average and product of three numbers submitted by the user. The program should display the results in a tabular format as follows: 2. Write a PHP program for a temperature converter. The user is asked to enter the temperature in Celsius. Then, the program converts and prints it in Fahrenheit using the following formula: Fahrenheit =(59 Celsius )+32 3. Write a PHP program that prints the diameter, area and circumference of a circle whose radius is entered by the user. Use the constant value 3.14 for pi (). 4. Write a program that asks the user to input a number of apples, then tells him how many dozens of apples he has and how many extra apples are left over. (Test your program using different values such as 24, 35 and 8 apples). Hint: use the type casting to get the integer value of a number. For example, the result of 30/12 is 2.5, but the result of (int) (30/12)=2