An example of an unbalanced force is a. a bridge. b. a roller coaster going down the first drop. c. a tug of war game in which no one wins. d. a car parked in a garage.

car parked is balanced since it's not moving or anything. A bridge is also the same. It's like constant and balanced on both side. A tug of war game where nobody wins is like it's balanced between the two teams and nobody wins. Only a roller coaster going down is not balanced since it's moving downward as a result of not being balanced. Answer is b

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 : )

the answer is a. at the equator