Calculate the wavelength of second line of brackett series of a spectrum of hydrogen carbon​

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?