Jason kept track of the number of songs he downloaded each week for 10 consecutive weeks. This function models the number of songs he downloaded, where x is the number of weeks: N(x) = -3(x − 4)^2 + 60.

Plot the axis of symmetry and the vertex for this function.

see below

Step-by-step explanation:

Since this is written in vertex notation the vertex is (4, 60). The axis of symmetry is equal to the x - coordinate of the vertex which is the vertical line x = 4.

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.

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.