please answer both 41, 42

Question 41 C 0/1 pt 9 3 - 19 1 Details Here is a bivariate data set. X y 28.7 43.4 22.9 51.1 29.8 42.9 27.6 26.1 28.3 75.5 27.8 51.5 27 38.1 27.6 51.8 30.9 37 Find the correlation coefficient and report it accurate to three decimal places. r = Submit Question Question 42 C 0/4 pts 9 3 19 0 Details Before you attempt this question, on your graphing calculator hit MODE and turn STATDIAGNOSTICS on! (Or hit 2nd-0 and find DiagnosticOn in the catalog.) Donald is investigating how long his phone's battery lasts (in hours) for various brightness levels (on a scale of 0-100). His data is displayed in the table and graph below. Brightness Level (x) 31 31 32 34 55 71 75 9 Hours (y) 5.5 5.8 5.7 4.8 4.8 3.4 1.2 2.7 Hours - N 10 20 30 40 50 60 70 80 90 100 11 Brightness Level a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. (You should begin by typing y-) b) Interpret the slope in context. Donald should expect -0.0543 brightness level per hour. Donald should expect -0.0543 hours per brightness level. ) What does the equation predict for the number of hours the phone will last at a brightness level of 99? hours d) Calculate the correlation coefficient r