Vida painted 3 rooms in 12 hours. Each room had 450 square feet of wall space that was painted. At what rate did Vida paint, in square feet per hour?

She painted at a rate of:  

Step-by-step explanation:

Notice that since Vida painted 3 rooms in the given time (12 hours), and each room had 450 square feet of painted wall, she painted a total of:

3 * 450 square feet = 1350 square feet = 1350

Since she painted that number of square feet in 12 hours, the rate at which she painted was:

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.