3x(y^3 z) if X=(1)/(2), Y=-2, and z=5
This question is easier than it first appears - all you have to do is put in 1/2 in place where it says x, -2 where it says y and 5 where it says z.
3x(y^3 z) => 3*(1/2) * ((-2)^3 * 5)
= 3/2 * (-8*5)
= 3/2 * -40
= -60