What is the difference between marginal cost and marginal revenue?
-Marginal cost is the money earned from selling one more unit of a good. Marginal revenue is the money paid for producing
one more unit of a good.
-Marginal cost is the money paid for producing one more unit of a good. Marginal revenue is the money eared from selling
one more unit of a good.
-Marginal cost is the money a producer might make from one more unit. Marginal revenue is the money a producer actually
makes from one more unit.
-Marginal cost is the money a producer actually makes from one more unit. Marginal revenue is the money a producer might make from one more unit

There are 25 elements found in living things. how many of these elements are found in some organisms but not all? 1 , 6 , 19 , 25

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

At what age must a person begin receiving their roth 401(k) payments?