1. What distances can you be certain of on the ruler in Model 1?

Zero cm and 10 cm

if my answer helps you than mark me as brainliest

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

because if the tool that you are using is not balanced it there would be false mass.