You will type
400*2*1.5
1.5 is another way to say 1 1/2
<span>Felipe looks over his presentation, and he notices that some of his words are written in bold and some are written in italic.</span>His ability to remember these differences is an example of Retroactive encoding. Even though you didn't share the options, I am pretty sure this one will help!
The user interface (correct answer is a)