Gys I need your help

what is 10+10

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship