Which mathematical term cannot be precisely defined?

How much orange juice do you need to make 2 servings of lemony orange slush?

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points