5.1÷104 need rounded to the nearest tenth. can't seem to figure it out.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Will give brainliest what is the value of x? enter your answer in the box.

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