exam Maths Puzzle Numerical Ability

These problems are really giving me some trouble, will someone please help!
If:
tanA=(-2/3) and 90 degrees < A < 180 degrees, find sinA.

Thank you again for your time, Natalie

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exam Other Question
find (a)f o g (b)g o f .find the domain of each function and each composite funcition.

Given: f(x)= x^2 +1 g(x)=square root of x


i can find f(g) and g(f) but i cant find the domains y>3x