What is -49/84 reduced to its lowest form?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Bring the fraction a/a-4 to a denominator of 16-a^2

Which graph represents the linear function below? y-4= (4/3)(x-2)