What is the simplified answer for -2/3+4/3

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

On which number line are -3 and its opposite shown

Asalad dressing recipe calls for 1 teaspoon of vinegar and three tablespoons of olive oil to only make 1/3 of the recipe for a single portion how much of each ingredient would you need