exam Maths Puzzle Numerical Ability

30. use the properties of logarthms to write the expression as a sum, difference,and/or constant multiple of logarithms(assume all variables are positive). Ln(x^2-1/x^3), x>1

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Help! I am a bit confused!
Here is my problem: "The square of the sum of a number and 5 is 36. Find the numbers."

Are they asking me to find the square of 31? (since 31+5=36)... I am a little lost...

Please help! Thank you!! The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spends $ 2000 a month on advertising , the revenue was 120,000 .If the revenue is now 180,000 , how much is the owner spending on advertising?