Is there any way to help me with number 7?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Consider the graph of the exponential function y=3(2)×

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.