exam Maths Puzzle Numerical Ability

Please help me solve this problem. simplify: (3x^3y^-4)^3

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exam Other Question

There is a problem I am really stuck on: 2/3! +1/ 1/2! +4. I have already figured out part of it and where I am now is 1 1/3 / 4 1/2 or 4/3 / 9/2. I dont know what to do from there. write an equation in standard form or a line with the slope of 7 and a y-intercept -2.