exam Maths Puzzle Numerical Ability

How can I rewrite this problem as a single logarithm: 7lnx + 4lny -3lnz

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exam Other Question

I am suppose to simplify and be sure I execute all multiplication and division.

3{2[4(x^2+2)-2(x^2-5)]}

This is what I got 12x^2+108 Is this right?
Thanks, Lackinmath Can someone please answer this question and provide step by step detailed instructions. It is greatly appreciated. Thank you.

The numbers in parenthesis coincide with the year