To expand \(\frac{7}{4}\left(8h+3\right)\), you need to distribute \(\frac{7}{4}\) to both terms inside the parentheses.
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Multiply \(\frac{7}{4}\) by \(8h\): \[ \frac{7}{4} \cdot 8h = \frac{7 \cdot 8h}{4} = \frac{56h}{4} = 14h \]
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Multiply \(\frac{7}{4}\) by \(3\): \[ \frac{7}{4} \cdot 3 = \frac{7 \cdot 3}{4} = \frac{21}{4} \]
Now, combine the two results: \[ \frac{7}{4}\left(8h+3\right) = 14h + \frac{21}{4} \]
Thus, the expanded form is: \[ \boxed{14h + \frac{21}{4}} \]