Avehicle's fuel economy is affected by its speed. the data on spaller auto's most popular vehicle is shown in the table below where x is the speed (mph) and f(x) is the fuel economy (mpg). calculate the rate of change for the interval 45 ≤ x ≤ 55 a. -11.1 mpg/mph b. 11.1 mpg/mph c. -.09 mpg/mph d. 09 mpg/mph

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.

900 degrees

step-by-step explanation:

wertyujhgfdcvb

step-by-step explanation:

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%