Each week, Robbie earns $x mowing lawns and receives $15 as his allowance.
To find how much he will earn in total over 3 weeks, Robbie writes the following expression: x + 15 + x + 15 + x + 15

What are some other ways Robbie can write the above expression? Check all that apply.


A. 3x + 45


B. x + 15


C. 3x + 15


D. 3(x + 15)