For what values of theta (0<=theta<=2pi) maximum r-values occur on the graph the polar equation r = 2 cos4theta? Note that the maximum
r-value occurs at a point that is the maximum distance from the pole.

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.

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

I’m confused on how to work the pie charts