exam Maths Puzzle Numerical Ability

find the point of intersection of f(x)=x+2 and g(x)=-x-4

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exam Other Question

This questions is a logarithm it is
Loga under the square root of m^6 n^13 over a^8 B^5. I know this one is simple but I am not sure what the procedure is to get the answer.
solve and check thank you
Anna has 12 bills in her wallet, some $5 and some $10. The total value of the bills is $100. How many of each bill does Anna have?