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2 x 5 x 10 - 1= n 10 x 10 - 1=n 100 - 1 =n 99= n
6787000 = 6.787 x 10^6, so for N x 10^9 = 6.787 x 10^6, divide both sides by 10^9, and N = 6.787 x 10^-3 = 0.006787
Let 5x + y + 10 = N Then 5x = N - y - 10 x = (N - y - 10) ÷ 5. Obtain the values for N and y. Substitution in the equation above will enable a value for x to be calculated.
If number is a x 10^n it then becomes a x 10^(n + 2)
n=0.027