Help me with these Java Programming problems:

Thank you

Write a program that displays Welcome to Java, Welcome to Computer Science, and Programming is fun. (Compute expressions) Write a program that displays the result of 9.5 times 4.5 - 2.5 times 3/45.5 - 3.5 (Approximate pi) pi can be computed using the following formula: pi = 4 times (1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 +) Write a program that displays the result of 4 times (1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11) and 4 times (1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 + 1/13). Use 1 0 instead of 1 in your program. (Area and perimeter of a rectangle) Write a program that displays the area and perimeter of a rectangle with a width of 4.5 and a height of 7.9 using the following formula: area = width times height