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The water acidity in a pool is consider...

The water acidity in a pool is considered normal when the average Ph reading of three daily measurements is between 7.1 and 7.6. If the first two Ph reading are 7.18 and 7.55 and if the third reading is x, find the range of Ph value for the third reading that result in the acidity level being normal.

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`6.57 lt x lt 8.07`
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Read the following Passage. Understand the Mathematical concept in it and answer the questions that follow. Each question carries 1 score. The common difference of the arithmetic sequence 15,14,13,12,...... is 14-15=-1 . First terms of the sequence is 15 and the 15th term is 15+14x-1=15-14=1 . Similarly the 4th term is 12 and the 12^(th) term is 4. Its 16th term is, x_(16)=15+15x-1=15-15=0 . So the sum of the first 31 terms is also zero. that is if the n^(th) is m, then the mth term is n and the (m+n)^(th) term is zero. Seventh term of an arithmetic sequence is 10 and the 10^(th) term is 7. What is the common difference?

A N EXCEL PUBLICATION-LINEAR INEQUALITIES-QUESTION BANK
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