Suppose line k has equation x = 3. Compare the areas of ABCD and A'B'C'D' = ((1.2) ORK) (ABCD). Suppose ABCD is a rectangle with length and width w. Its area is given by the expression
change the value of the area. Therefore, the areas of ABCD and A'B'C'D'
a rectangle.
Rigid motions preserve lengths and widths, so they
be equal. Similar reasoning applies when ABCD is not

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.

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.