What's the average of 1.6 and 0.8 and 1.3

Can someone me i’m confused. will give brainliest and a whole bunch of points

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

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.