exam Maths Puzzle Numerical Ability

How do you Combine logs?

Log(base5)(x^2-1)-Log(base5)(x-1)

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exam Other Question

Solve: x/2+5x/10=-2 on a certain street , a section having an area of 4896.7 sq yds is paved at an expense of $12642.17. what would be the expense to a property holder who pays for 356.28 sq. yds of the pave?