Raymond B. answered • 03/06/21
Tutor
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Math, microeconomics or criminal justice
18^1 ends in 8
18^2 ends in 4
18^3 ends in 2
18^4 ends in 6
18^5 ends in 8
18^6 ends in 4
the cycle repeats: 8,4,2,6, 8,4,2,6...
2021 divided by 4 has remainder of 1, so the unit digit is 8 like 18^1, 18^5 and 18 to any exponent with a remainder of 1 when divided by 4
