8 + 9 = 17.
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8 x 109 has a value of 8,000,000,000.
ratio 8:3 same as 24:9
If you mean: x+8-x+9 when x = 5 Then it is: 5+8-5+9 = 17
24 ÷ 8 x 3 = 9
Square root of 8 = 2.82842712 It is clear from the value that it doesn't lie between 7 and 9.