exam Maths Puzzle Numerical Ability

add express in simplest form

x^2
over
x+10

plus
9x-10
over
x+10

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exam Other Question

Hi! For this question it asks to simplify, the problem is: a^-3 b^2.
What I got for this was ab^1. Please help me Thank You=)
-(3-10)-(6-3)
My answer is not coming out correctly.
Please see my version-

-(3+(-10))-3=
-(-7)-3=
-(-7)+(-3)= -13

The textbook gives the answer as 4. Where am I going wrong?

Thank you.