Mario is planning a charity dinner. each table costs $50 and each chair costs $7 to rent. the other costs of the dinner are $475. let trepresent the number of tables and let c represent the number of chairs. which of the following expressions represents the total cost of the dinner?

a. t + c + 475

b. 50t + 7c = 475

c. 7t + 50c + 475

d. 50t + 7c + 475

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.