Which formula could you use to calculate the total energy in a system?* A. Total Energy = PE + KE
B. Total Energy = PE-KE
C. Total Energy = KE - PE
D. Total Energy = PE X KE

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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.

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?