In a longitudinal wave, particle displacement is opposite to the direction of wave motion. Question 12. 12. In the Waves lab, you changed _____ to see how it would affect wave speed. (Points : 3) length of string tension of string type of string how hard you plucked the string Question 13. 13.
Six months If you file for an extension on your individual tax return, the IRS will give you six more months to complete the return. The IRS changed the extensions in 2006. There is now only the option for 6-month extensions (it used to be that you would file one extension, and could then file a second one for a total of 6 months).
It depends on how accurate your return was, what records you are talking about, etc. It's anywhere from 3 years, to 6 years, to forever. 6 years might be a good idea, especially for collection reasons. In many cases, the IRS will require the last 6 years of returns before working with taxpayers. If the IRS lost your return, you might need to resubmit it--so maybe 6 years generally, and 10 years or longer if you think the return might be incredibly weird.