3. The following formula enables us to compute the area a of a right triangle with sides x and y:
1 a = - xy 2Assuming that x and y are already placed in the corresponding variables of type double, write a Java code statement for assigning the corresponding value to the variable a of type double. Explain, step-by-step, which arithmetic operations will be performed first, which next, etc., and trace the computations on the above example. Describe two different ways to avoid getting 0 as the result of evaluating 1/2. Explain what happens if you simply write xy in your Java code.
6. Suppose that would like to add 2 to the number of years. If the number of years is stored in the integer variable years, which of the two lines of code leads to a correct increase: