Answer
$-\frac{3y^{11}}{28}$
Work Step by Step
$(-\frac{3}{4}y^{7})(\frac{1}{7}y^{4})=-\frac{3}{4}\times\frac{1}{7}\times y^{7+4}=-\frac{3}{28}\times y^{11}=-\frac{3y^{11}}{28}$
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