(1) 6. Suppose that the variable total already has the value 345.6789. Write the cout statement to create the following line of output: Your total amount is $345.68 (total is the variable to use in your cout statement.) (1) 7. Assume that the variable sum has already been assigned a value. Write the necessary C++ statement(s) to print the variable sum in octal and hexadecimal. (2) 8a. C++ supports value and reference parameters How does the programmer decide which type of parameter to use when creating a function? b. (True/False) Strings can be passed by using value or reference parameters