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_ATHAN_ [11]
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A soccer team played 160 games and won 65 percent of them. How many games did it win? 
Baltazar_Blake [14]
DeCrypt [18]
Tuesday, September 8th 2020, 1:25am
A=0, B=0, C=0 and D=0a.x3 +b.x2+cx+d = 0
which numbers are: A, B, C and D?
sorry, the question was what is X
but it's ok, valid as I did it wrong Magmar Consecrator
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Tuesday, September 8th 2020, 2:59am
Take a regular octagon with vertices labelled ABCDEFGH anticlockwise
What is the ratio of the lengths AB and AD?
The correct answer is 1 : 1 + sqrt(2), or about 1:2.414
Bad diagram:
Set the edges to length 1 for simplicity, since i only care about the ratio
Next, AD is equal to the red line plus 2 green lines
The red lines are 1, because the middle red line is just the same length as the top, which is an edge of the octagon
For the green lines use pythagorean's theorem, green^2+green^2=1^2
This gives green = 1/sqrt(2)
So AD has length 1+2/sqrt(2)
2/sqrt(2) = sqrt(2)
So AD has length 1+sqrt(2)
So the ratio is 1 : 1+sqrt(2)
Tuesday, September 8th 2020, 3:05am
Sorry, i read wrongTake a regular octagon with vertices labelled ABCDEFGH anticlockwise
What is the ratio of the lengths AB and AD?
The correct answer is 1 : 1 + sqrt(2), or about 1:2.414
Bad diagram:
Set the edges to length 1 for simplicity, since i only care about the ratio
Next, AD is equal to the red line plus 2 green lines
The red lines are 1, because the middle red line is just the same length as the top, which is an edge of the octagon
For the green lines use pythagorean's theorem, green^2+green^2=1^2
This gives green = 1/sqrt(2)
So AD has length 1+2/sqrt(2)
2/sqrt(2) = sqrt(2)
So AD has length 1+sqrt(2)
So the ratio is 1 : 1+sqrt(2)
i thinks the angle xD is 45° easy...but is the ratio 
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