gina painted 3/7 of a picture and George painted 2/7 of the picture. how much did they paint together

Write an algebraic expression for the word expression the quotient of c and 8

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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.