The model below shows a carbide ion. 

What could be done to change this carbide ion to a neutral carbon atom?

remove 2 electrons 

add 2 electrons

remove 4 electrons 

add 4 electrons

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.