I'm struggling in marked question in this exercise. I already have the answer provided by the book but I did not know the process to get that number. Please help me, thank you much!

In Exercises 23 - 32, use the Limit Comparison Test to deter- mine the convergence of the given series; state what series is used for comparison. 1 23. n2 - 3n + 5 0=1 24. An - 12 n = 1 OO Inn 25. n - 3 n=4 1 26. M Vn2 + n n= 1 OO 1 27. n + Vn n=1 00 n - 10 28. n2 + 10n+ 10 n=1 00 29. sin ( 1 ) n= 123, Converges; compare to n=1 OO Inn 25. Diverges; compare to n 27. Diverges; compare to E sinn 29. Diverges; compare to -. Just as lim 1 , n n n=1 sin(1) lim = 1. 1