A pair of tennis shoes were reduced from $120 to $72. By what percentage was the price of the pair of tennis shoes reduced?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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.

What is the sum of these mixed numbers 4 2/3+ 3 1/9