book Maths Puzzle Numerical Ability

find the nth term of the arithmetic sequence described,

-7,-3,1,5...for n = 35

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book Other Question

How do I simplify and divide teh square root of 7 over the square root of 8? I am not to sure as to how to write "log y -(log 7 + log f)" as a single log. I really need help with this