Would anyone know the correct answers to these three math questions? what is the sum of the measures of the interior angles of a 21-gon? what is the measure of an exterior angle of a regular pentagon? c) determine which of the following could be the side measures of a right triangle. select all that apply. 5 ft, 4 ft, 3 ft 6 ft, 4 ft, 2 ft 11 ft, 10 ft, 6 ft

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.

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

abby has a greater debt becasue she owea 5 more then alan does