One less than the quotient of four and a number x

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.

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

Two numbers have a sum of -19. one number is x. what expression represents the other number?