exam Maths Puzzle Numerical Ability

Can you help me find a example of when log(A+B) = log(A) + log(B) would be true?

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exam Other Question

x^2-(x-4) The length of a spring is given by L= 3/4 F + 8, where F is the applied force. What force will produce a 10. I believe the answer will have to be a decimal. Thank you.