Question

$y= \frac{y(y ^{3})^2 } {y ^{3} }$

Answer 1

$\frac{y( y^{3})^{2} }{ y^{3} } = \frac{y( y^{6} )}{ y^{3} } = \frac{ y^{7} }{ y^{3} } = y^{4}$