16 to the second power = 162 = 256
16x16= 256
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Four to the second power is 16 or four squared.
42 = 4*4 = 16
42 + 5 = 16 + 5 = 21
It is512 2x2x2x2x2= 32 4x4= 16 32x16= 512
2 to the 4th power = 16 multiplied by 5 = 80 plus 5 to the 2nd power = 25 mulitiplied by 7 = 255