If you were in a canoe traveling downstream at 5.5 mph and your wheel falls off how many boxes of waffles does it take to re-shingle your house?

The answer is approximately 7.19%

Explanation:

XDDD

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )