Which statements include two quantities in the real world that are additive inverses? select each correct answer. a rock climber ascends 19 feet and then descends 9 feet. a child runs 10 feet to the right and then runs 10 feet to the left. a person deposits $430 in to a bank account and then withdraws $430 from the account. a person removes 14 cans from a shelf and puts 15 cans back on the shelf.

did the test A. and C. are the answers

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.