How are a parallelogram and a trapezoid different? A. A trapezoid has only 1 pair of parallel sides, but a parallelogram has 2. B. A parallelogram has 4 right angles, but a trapezoid doesn't need to have 4 right angles. C. A parallelogram has only 1 pair of parallel sides, but a trapezoid has 2. D. A trapezoid has 4 right angles, but a parallelogram doesn't need to have 4 right angles.

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.

spinning a 1, 2, or 3. option d.

step-by-step explanation: when spinning a number graph up to 4, and aiming for any number less than 3, that automatically eliminates the number 4. now you have two numbers to spin on that are less than 3, but the number 3 is included in this question because it's no greater of an number than itself. i hope this you : )

you already gave the answer

step-by-step explanation: