the picture is the answer choices but points (-21, 1/2) and (-7, y) have a slope of -1/7. find the y coordinate of the point.

What are the possible rational zeros of [tex]f(x) = x^4+2x^3-3x^2-4x+18[/tex]

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.

Paul’s car is 18 feet long. he is making a model of his car that is 1/6 the actual size. what is the length of the model?