Evaluate the following a. [2.5-3×[1.3] b. If {a} is a geometric sequence of non-negative real numbers with a = 2 and a = 6 find a c. If {a} is an arithmetic sequence of real numbers with a₁ = 2 and a4 = 6, find az

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A: The given sequence in the question is:

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Q: Write the arithmetic sequence – 19, – 23, - 27, – 31, ... in the standard form:

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A: To determine: first five terms. Given: bn=(-1)n(4n-4)

Q: 4. Find the value of x so that x+7, -x-1, x+ 13,.. shall form a geometric sequence.

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A: given an=-3an-1+5if an=2