An instructor at Arizona State University asked a random sample of eight students to record their study times in a beginning calculus course. She then made a table for the total number of hours studied(x) over a period of 2 weeks and test score(y) at the end of the two weeks. Here are the results. x 10 15 12 20 8 16 14 22y 92 81 84 74 85 80 84 80(i) Find the regression equation for the data points.(ii) Graph the regression equation and the data points. (iii) Describe the apparent relationship between the two variables under consideration.(iv) Interpret the slope of the regression line. (v) Identify the predictor and the response variables. (vi) Predict the score of a student who studies for 15 hours.

c is the answer

step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

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%