I need help which triangle theorem do I use for these

John can eat 10 cookies in 1/2 hr how many cookies can he eat in 45 minutes make a proportion and solve

15 point ! ~ see if you know the answer to both you!

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.