No.
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It is 11.40175.
x2 + 20x +0 =30 [(20/2)2 =100] x2 + 20x + 100 =30 +100 √(x+10)2=√130 x+10=√130 x= −10+√130 √ means square root
Its 130. An easy way to do this is by using logic, rather than math. Since 13x13 = 169, and 16900 = 169x100 = 169x10x10, 16900 = (13x10)^2
Well, darling, to find 130% of a number, you just multiply the number by 1.3. So, in this case, 39 is 130% of what number? Simple math tells us that the number is 30. But hey, who's counting?
The formula is: (130/360)*pi*42 in square meters