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

please help.find the length and width of rectangle ABCD . Toop left A top right D bottom left B bottom right C .between B and C is P=140 cm. between D and C is x.Thanks for helpin I have no idea how to type in math problems - (i.e., Squared, etc.)
My problem is finding the LCD and steps to solve reational expressions.
7x + 1 divided by x squared minus 9 (minus) 5 divided by x minus 3
Thank you!