exam Maths Puzzle Numerical Ability

how would i do this? Simplify the following fractions by putting them in lowest terms or by performing the indicated operations.

xy-zy over y times xw-xy over yz yw

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exam Other Question

Let T:R2->R2 be the linear transformation which rotates vectors by 3pie/4 radians and then reflects those vectors about the x-axis.

a) Find the standard matrix of T. Hi! Could someone please help me to simplify (all exponents should be positive)

4x^3*(3y)^4

and

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

Thanks so much for the help!