book Maths Puzzle Numerical Ability

How do I simplify and divide teh square root of 7 over the square root of 8?

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book Other Question

On Saturday morning, Lynn walked for 2 hours and then ran for 30 minutes. If she ran twice as fast as she walked and she covered 12 miles altogether, then how fast did she walk? find the nth term of the arithmetic sequence described,

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