exam Maths Puzzle Numerical Ability

I need help please!!

Solve by adding like terms :

-3xy + 8xy^-1x^0 / y^-2 - 3x^2x^-1x / (x^-1)^-1

Thank u!

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exam Other Question
Using verifications solve:
theta=@

Sin@-cos@+1/Sin@+cos@-1= sin@+1/cos@ Please help.

Please Evaluate the following.

|-20|-|5|. My answer is 15. Is this correct.

Thanks
JMS