Two negative charges are both -3.0C push each other apart with a force of 19.2N. How far apart are the two charges?

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

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 : )