Alan

Or 9/20 in fraction form.

Number of games in season = N

Number of games played = 0.8N    Number of games remaining = 0.2N

Number of games won so far = 0.4*0.8*N = 0.32N

Assuming there are no draws then total number of wins must be 0.5N to match total number of losses

Hence number of remaining games that must be won = 0.5N - 0.32N = 0.18N

As a percentage of the number of remaining games this is 100*0.18/0.2 =  90%

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$$\sqrt{4x^2}-\sqrt{x^2}\rightarrow2|x|-|x|\rightarrow|x|$$

|x| = 6 when x = 6 and when x = -6

(Perhaps I should note that |x| means the absolute value of x)

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A Mach number is a measure of speed.  It is the speed of the plane divided by the speed of sound.  For example, a plane flying at Mach 2 is travelling at twice the speed of sound.

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As of 11 August 2015 it still isn't working!

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Thanks Melody, the picture makes it much clearer.

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tan(θ) = width/70 so 

$${\mathtt{width}} = {\mathtt{70}}{\mathtt{\,\times\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{tan}}{\left({\mathtt{54}}^\circ\right)} \Rightarrow {\mathtt{width}} = {\mathtt{96.346\: \!734\: \!432\: \!97}}$$

or width = 96 ft to the nearest foot.

(I've assumed the angle, θ, is between the line of sight to C and the line AB)

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If x = 33 then 

3y + 4z = 34      (1) and

y + z = 2           (2)

Multiply (2) by 3

3y + 3z = 6       (3)

Subtract (3) from (1)

z = 28

Substitute this into (2)

y = -26

This violates the condition "x,y,z are at least over 1"

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