28 = 256 . Note: It likely will be worth your while to learn the 210= 1024 and work down or up from there if you need to know powers of two.
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negative eight plus two times four to the second power
8 divided by 2 = 4 4 to the second power (42) = 16 The square root of 16 = 4
Eight and forty-two thousandths
2.80006 X 10*7 that is two point eight zero zero zero six times ten to the power of seven
262144