Please solve I will give brainliest if correct

What is the slope of the line shown below?

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.