Carla is 5 years old and jim is 13 years younger than peter. one year ago peter's age was twice the sum of carla and jim's age. find the present age of each of them

Answer this question, only if you know the answer. 30 points and brainliest!

Which of the following is true for the relation f(x)=2x^2+1

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.