Answer
$y^{42}$
Work Step by Step
We are given the expression $(y^{6})^{7}$.
To simplify, we can use the power rule, which holds that $(a^{m})^{n}=a^{m\times n}$ (where a is a real number, and m and n are integers).
$(y^{6})^{7}=y^{6\times7}=y^{42}$