Chapter 21 discusses four aspects of the speaking situation you should take into account when planning the graphics you'll use in an oral presentation including the length of the presentation, the size and layout of the room, and the available equipment. What is the last aspect?

The answer is "audience aptitude and experience "

Explanation:

The presentation is the ability to provide a variety of audiences with successful and stimulating interactions. The main objective of an oral presentation is to talk formally to a live audience about a particular subject. You have to write an oral speech that engages the audience and fulfills your goals.

In this type of presentation, the Listener-centric concept is effective as the productivity of a speaker is enhanced by creating and presenting the speech throughout the proper manner.

which functions return a valid value without any arguments?

(-blank- and -blank- return a valid value without any arguments.)

1st -blank-

today

sqrt

count

2nd -blank-

round

now

sqrt