Write a Java statement that implements the following algebraic equation assuming that all variables have double data type: z = 5y + 4x 3x + 2y Question 7 (3 mark): 1 ft = 30.48 cm, write a program that converts length in ft into cm and print out. The input is a length in ft typed by user, the output is a length in cm. REQUIREMENTS The user input is always correct (input verification is not required). Assume each value is in double type. Your code must use the Scanner class to read the user input. Your code must work exactly like the following example (the text in bold indicates the user input). Example of the program output: Enter length in ft: 12.1 Length 368.808 centimeters Question 8 (3 mark): Implement class Swap Int as follows and complete this incomplete code: class SwapInt { public static void main (String[] args) ( int a Integer.parseInt (args [0]); int b Integer.parseInt(args [1]); System.out.println("Before: " + "a = + a + } -- Please insert your code here for swapping a and b -- */ System.out.println ("After: "+"a = " +a +", b = " + b); "+b); Consider the following steps to swap values stored in a and b: 1. Declare a variable temp (in a way similar to a and b) 2. Assign the variable a to the variable temp 3. Assign the variable b to the variable a 4. Assign the variable temp to the variable b