Fill in the blank to make equivalent rational expressions. (5)/(3u^3)=(square )/(3u^8)

To make the rational expressions equivalent, we need to find a value for the numerator in the second fraction that makes the two fractions equal.<br /><br />Given:<br />$\frac {5}{3u^{3}}=\frac {\square }{3u^{8}}$<br /><br />We can see that the denominators are related by a factor of $u^5$. To make the two fractions equivalent, we need to multiply the numerator of the first fraction by $u^5$.<br /><br />So, the numerator in the second fraction should be $5u^5$.<br /><br />Therefore, the equivalent rational expression is:<br />$\frac {5}{3u^{3}}=\frac {5u^5}{3u^{8}}$