Which equation could be used to solve for the length of xy? a: xy = (22)sin(41°) b: xy = (22)cos(41°) c: xy = 22/cos(41°) d: xy = 22/sin(41°)

XY = 22 / sin 41°

The triangle is a right angle triangle. Therefore, trigonometric ratios can be applied to find XY.

sin 41° = opposite / hypotenuse

sin 41° = 22 / XY

cross multiply

XY sin 41° = 22

divide both sides by sin 41°

XY = 22 / sin 41°

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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.