1. simplified form of x^4-81/x+3.

2. simplified form of (x^2yz)^2(xy^2z^2)/(xyz)^2.

#1. The problem ask to find the simplified form of the said equation, so in calculating it, you must first get is factored form and that is (x^2+9)(x^2-9)/x+3 then expand again, (x^2+9)(x+3)(x-3)/(x+3), then cancel the value and came up with an answer of (x^2+9)(x-3). 
#2 In getting its answer you must follow the rule of a^m/a^n = a^m-n and then you will get the answer of y^2z^2x^3. I hope this would help 

Iknow one of the answers is a and maybe b but not 100% sure about b