Divide 5/6 by negative 2/3

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

Given the equation −4  = 12, solve for x and identify if it is an extraneous solution.

Apudding recipe requires 2/3 of a cup of milk for every 1 3/4 cups of sugar. what is the unit rate of sugar to milk in the pudding recipe?