If a system of linear equations has one solution, what does this mean about the two lines?

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

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.

Which of the following describes the symmetry of the graph of y = x3?