The left and right page numbers of an open book are two consecutive integers whose sum is 293.  find these page numbers. the smaller page number is : the larger page number is:

Since they are consecutive, we can define the two unknowns with ease.

The left page (has a smaller value) can be defined as X, and the right page can be defined as X+1.

So,

X + (X+1) = 293

2x+1 = 293

2x = 292

x = 146

So, as we defined before, the smaller page number is equal to x.  Therefore, the smaller page number is 146, and the larger page number is 147.

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

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.