m to the second power means multiply m by itself, or m x m.
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the second power means you multiply the number by itself. 32 to the second power would be 32*32. 32 to the third power would be 32*32*32
2a to the second power. If you combine the like terms, (a to the second power + a to the second power), it would be the same as 2a to the second power.
20.8
8x to the second power is 64x2
m5/m3 = m2