En las bóvedas del banco central de Bolivia guarda 3000 lingotes de oro, están fabricadas de una aleación de oro-cobre de 23 quilates de oro las dimensiones de cada lingote son 0.25m por 0.4pies y 3.15 pulgadas además se sabe que la densidad relativa es 16.2 los precios a nivel internacional para el oro es 337 dólares por oz troy y el gramo del cobre cuesta 12 bs

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter