A jar contains dimes and quarters. Twenty percent of the coins in the jar are dimes. A number generator simulates randomly selecting 10 coins from the jar. The number generator is used 12 times and the number of dimes in each trial is shown in the dot plot.

Which description is correct about the number generator being fair or not?

Which shows the pre image of triangle xyz

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.

Need so much on this one how many yards?