Why will the slope of any horizontal line be 0? Why will the slope of any vertical line be undefined? Complete the answers. the slope of a horizontal line will always be 0 because the y-coordinates of any two points be . therefore the in the slope formula will always be 0.the slope of a vertical line will always be undefined because the x-coordinates of anytwo points will be. therefore the the in the slope formula will always be 0 since you cannot divide by 0 the slope will always be undefined

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

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.

step-by-step explanation: