while constructing a new bridge the contractor needs to order a counterweight to provide balance while the pieces of overpass are being put into place the contractor knows he needs at least 11,000 lbs..but the rental facility only rents counterweight by thr whole ton. How many tons does the contractor need to rent?​

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.