Can someone please answer #3

The second option

Step-by-step explanation:

Plug in one variable at a time

The first one

2(1)/1+1 should equal 2/2 or 1, but they have 2/3

Plug with other numbers and they don't work either

The second one

1 works, as shown previously

Now let's try 2

2(2)/2+1 should equal 4/3, which is what is stated

Keep on going with increments of 1 until you get to 5 and you'll see that all of them work

The third one

It just doesn't follow a patterned sequence with increments of the same number

Same situation for the fourth one

Therefore, the second option is the only one that works

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.

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step-by-step explanation: