exam Maths Puzzle Numerical Ability

Hi! I need some help to simplify and all exponents should be positive.

(2^-1a^2b)^-3
------------
4a^-9

and

(3x4y^3-5y)-(2x+3y^3-5y)

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exam Other Question

Your teacher is giving you a test worth 100 points and containing 40 questions. There are 2-point and 4-point questions on the test. How many type of question are on the test? What is the graph of x=-4?