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x+5=10 x+5-5=10-5 x=5
(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000
865 = (8 x 100) + (6 x 10) + (5 x 1) OR (8 x 10^2) + (6 x 10^1) + (5 x 10^0)
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which expression is equivalent to (3 x 10^3) (5 x 10 ^5) sorry that is what i ment