3discounts of30% ,35%, and 20% are applied to an item what will be thetotal percent markdown?

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges