Question

A ____usually requires calculations that are too complicated to do by
hand. ​

Answer 1

I'm answering this, so I can message you and help with with art.

Answer 2

computer model

Step-by-step explanation:

Computer models are cheaper to set up than alternative methods that could be used to predict what will happen in a system, ex. building a prototype. Other benefits include being able to: make alterations and quickly see the outcomes.