Please help with this ASAP, I rlly don’t understand if you just add or subtract. 15) What is the to number of years shown on the timeline?

The timeline chart is right in the picture and so is the question (extra points on this one)

Click on  the link  to view information gathered by the organization keep america beautiful. read "the costs of american littering" to find three negative effects of litter in local communities.  based on your research, what are the negative effects of litter in local communities? check all that apply. litter cleanup is very expensive. litter has decreased since 1969.litter is a constant community problem. litter causes property in the community to be less valuable. litter contaminates water and has other environmental consequences.

Which of the following methods could be considered a "best practice" in terms of informing respondents how their answers to an on-line survey about personal information will be protected? respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured. respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member's office. the investigator uses the informed consent process to explain her institution's method for guaranteeing absolute confidentiality of research data. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed

Identify whether the following features belong to the early dynastic period or the old kingdom.