A piece of stone or is shaped like a sphere with a radius of 4 feet what is the volume of the sphere use pi in round the answer to the nearest 10th

Tiara buys the pizza shown below: a circular pizza is shown. the edge of one slice is marked ab. what does the curve ab represent?

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.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'