You spent 2 hours on homework yesterday. Today you spend 4 hours. What is the percent of increase?

See below

Step-by-step explanation:

With regards to the above, since 2hours was spent yesterday , and 4 hours today, the percentage of the increase would be 200%

The reason being that since double of the hours spent yesterday on homework were spent today, hence 200%

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

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.