It is: 42 = 16
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4,096 or 4 to the sixth power. When multiplying numbers with powers you add the powers if the whole number is identical. 4 squared x 4 squared is 64, x 4 squared is 4096
4
-16
16 22 x 22 =16 because 22 =4 and 4x4 is 16.
(4/5)-2 = (5/4)2 = 25/16