Question 7633
(2x to the 4th power yz to the third power)squared
= {(2x)^4 * (yz)^3)}^2
= {(16x^4)*(y^3*z^3)}^2
=(16^2 * x^8 * y^6 * z^6 )
= (256 * x^8 * y^6 * z^6 )  (Ans)

about second part the question is not clear

let the variable is x its fourth power is   x^4    ^ means to the power