100 pts. If the sin 30° = one half, then the cos 60° = . 0, because the angles are complementary one half, because the angles are complementary square root 3 over 2, because the angles are complementary 1, because the angles are complementary

1 is the answer

Step-by-step explanation:

its right

answer: i think the answer is etheir c or d but i don't know which one but have a good day!

step-by-step explanation:

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.