exam Maths Puzzle Numerical Ability

MAYSOMEONE HELP ME WITH THIS PROBLEM??

5(x+y) + 9(x+y)

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exam Other Question

Can you help me find a example of when log(A+B) = log(A) + log(B) would be true? This is asking to find the distance between (6,0)and (-7,0)

I am getting stuck on the first step, how do bracket (0,0)?
please help