exam Maths Puzzle Numerical Ability

Is f(x)= -2x a one to one function?

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exam Other Question

KEEP GETTING THESE WRONG - HELP PLEASE

Need to solve:
log9(1/3)=y

Need to simplify:

e^x * 4e^2x+1 (the 2x+1 is all in exponent)
Thanks
LLO Find the sum. Express the answer in simplest form.

-6g^2+9/h^2-2 + 7g^2-6/h^2-2