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?