1. Write a PHP program that calculates and prints the average of two numbers ( 9 and 6). 2. Write a PHP program that calculates the difference between two numbers: 8.2 and 3.6, using the shown text format. \begin{tabular}{l} \hline color: red \\ font-family: Georgia \\ font-size: large \\ \hline \end{tabular} 3. Write a PHP program that calculates the sum, average and product of four integers (12,15,13,3). The webpage should display the result in a tabular format as follows