HELP PLEASE ITS FOR A TEST ILL GIVE BRANLEST THING ITS SIXTH GRD MATH

Find the slope of a line given the following two points

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.

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have