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using the trigonometric functions

sin A = opposite / hypotenuse = a / c

cos A = adjacent / hypotenuse = b / c

tan A = opposite / adjacent = a / b

sin 75=opposite/150

make shadow length subject by multiplying by 150 on both sides to give us

sin 75 * 150= shadow length

0.9659 *150= shadow lenght

shadow lenght= 144.88888

Therefore, the correct answer is A 144.89 feet

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