Acircle is centered at the point (-7, -1) and passes through the point (8, 7). the radius of the circle is units. the point (-15, lies on this circle.

well, we know the center of the circle is at (-7, -1), and we also know a point on it is (8, 7), hmmm what's the distance between those points anyway?

well, a distance from a point on the circle and the center is namely the definition of its radius.

so, we know the distance from a point to the center.... ok, so the point (-15, y) is on the circle too, therefore it must have the same distance "r" too,

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.

answer: no

step-by-step explanation:

you are only given the cost not the amount of pounds.