PLEASE HELP ASAP!!! DUE TONIGHT AND I DON'T GET IT

Thirty people are waiting in line at the cinema. Alex counts 13 people in front of him. Gina counts 21 people between her and Dana. What is the least possible number of people between Dana and Alex?

What are “like terms”? why can we only add like terms?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?