Solve question number 4
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Let X = 0.99999....
Because there is only 1 repeating number multiply by 10.
Multiply with 10:
10x = 10 x 0.999
Simplify:
10x = 9.999
Subtract x:
10x - x = 9.999 - 0.999
9x = 9
Divide both sides by 9:
x = 9/9
X = 1
so 0.99999.... = 1