Can you help with 1 & 2?

2. Consider this infinite power series: x 5 7 + . . . (all the odd powers, alternating in sign). 1. Express that power series in correct summation notation. 2. Apply the Ratio Test to determine the radius and interval of convergence for that power series. Write a couple of sentences explaining what that interval of convergence means, what it tells us about the original power series and values of x that can be plugged in