Find the gcf of 18a, 20ab, and 6ab. show work plz. i need it answered in like 5 min

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

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.

Triangles abd and ace are similar right triangles. witch ratio best explains why the slope of ab is the same as the slope of ac?