Question

four times y to the fourth power

Answer 1

$4{ y }^{ 4 }\\ \\ ={ y }^{ 4 }+{ y }^{ 4 }+{ y }^{ 4 }+{ y }^{ 4 }\\ \\ =4\left( y\cdot y\cdot y\cdot y \right)$

Answer 2

(x 2 y) 4 = x2*4 y 1*4  = x 8 y4