Find the radius of convergence, R, of the series. 00 x7 +9 9n! n = 2 Find the interval, I, of convergence of the series. (Enter your answer using interval notation.) Step 1 We will use the Ratio Test to determine the radius of convergence. We have the following. lim n→ ∞ +7 + 10 a, n+1 = lim 9(n + 1)! an n→ ∞o +7 +9 9n! = lim noo xn+10 9(n + 1)! Step 2 Simplifying, we get lim n→ ∞o X n! n! x7 +9