Closer to 2. If you round it, because the number after the 2 is less than 5 you round it down so it's closer to 2
6.4^4 (b^3) or as shown in photo
The 4th one goes with the 1st box
The 2nd one goes with the 2nd box
The last one goes with the 3rd box
For this case we must indicate the value of the following expression, expressed in scientific notation:

We have that for multiplication properties of powers of the same base, the same base is placed and the exponents are added:

Then, rewriting the expression we have:

Answer:

You have ti distribute the 5n into the brackets.
so then youll have 15n^2 + 40n.