Question

Help me figure out how to simplify this please:

Answer 1

Think of it this way: 
8^3 means you have 3 times 8 multiplied together (8*8*8) 
Now this block is raised to the power of 7, so there are 7 blocks of 8*8*8 multiplied together. 
How many 8s do we have? 7 blocks of 3s, 7*3=21
Thus n=21