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please help. my teacher just gave me this and wwanted to to know exactly what to do, with no explanation

please help. my teacher just gave me this and wwanted to to know exactly what to do-example-1

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\begin{gathered} u\text{sing : Tan 70 = }(71)/(y) \\ \\ 2.747\text{ = }(71)/(y) \\ 2.747y\text{ = 71} \\ y\text{ =}(71)/(2.747)\text{ = 25.84ft} \end{gathered}

please help. my teacher just gave me this and wwanted to to know exactly what to do-example-1
User Ryan Ogle
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