I posted about some things being just not "spin"able. Math

I posted about some things being just not "spin"able. Math is not always so positive about this:

Slow day so I will ask a couple of math questions and my following post will give the answers:

1. Does 3.99999..... = 4.00000....... ?

2. Does 2/3 + 3/4 = 5/7 ?