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|dw:1377820249011:dw|
IDK what angle of depression is fill it in the diagram.

|dw:1377820432735:dw|

|dw:1377820519249:dw|

Lets clean it up a bit so we can work on it
|dw:1377820572079:dw|

looks like sin is best here
sin(7)=opp/hyp=400/x :)

x (sin 7)=400\[\frac{ x (\sin 7) }{ \sin 7 }=\frac{ 400 }{ \sin 7 }\]

\[x \approx 3282.2\]

well was i close enough

you are correct :D but round

cool thanks @timo86m

You are welcome