X = 21
Hope this helped :)
The length of the shadow is 124.7 in
<u>Explanation:</u>
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Given:
Angle, θ = 30°
Height of the fence, h = 72 in
Length of the shadow, l = ?
Given:
tan 30° = 

Therefore, the length of the shadow is 124.7 in
the answer would be x=−0.870452,0.712370