Write an equation that expresses the relationship. Then solve the equation for \( u \). \( n \) varies directly as the cube of \( b \) and inversely as \( u \). \( n=\square \) (Use k as the constant of variation.)
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Bonus Knowledge
To express this relationship mathematically, we can write the equation as: \( n = k \frac{b^3}{u} \) To solve for \( u \), we can rearrange this equation: \( u = k \frac{b^3}{n} \) Now you've got a clear equation expressing how \( u \) is related to \( n \) and \( b \). This is a great example of the interplay between different variables in a mathematical model! Let's take a moment to think about how these concepts pop up outside of math classes. For instance, in physics, you often see direct and inverse variations used in formulas. Think about how pressure varies with volume in gases: as volume increases (direct relationship), pressure decreases (inverse relationship). Understanding these relationships can help solve real-world problems!
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