machine produces 268 bolts in 28 minutes. At the same rate, how many bolts would be produced in 21 minutes?

200.97

Step-by-step explanation:

 ok look I think this is solved so it is 268 bolts what is done in 28 minutes we divide 268 bolts by 28 minutes to see how many bolts are made each minute and the result is 9.5714 bolts per minute then we now do 9.57 for 21 minutes the result is 200.97

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.

ab will be equal to