What is the vertex form of the function y = x2 + 8x – 3

Which expression is equivalent to 2x^2+7x+4?

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.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16