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Maths Help- Best answer goes to best explained one?

This has to do with arithmetics (sequences and seires). I will give the Best answer to the person who can explain the answer clearly.

Q1: Find k given the consecutive arithmetic sequence:

5,k,k^2-8 (k^2 means k squared)

Q2: Here is a finite arithmetic sequence: 36, 35 and 1/3, 34 and 2/3...,-30 How many terms does the sequence have?

Q3: An arithmetic sequence starts 23, 36, 49, 62. What is the first term of the sequence to exceed 100,000?

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