Russell 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) M 47 58 63 Hours (y) in 4.9 1.7 4.9 SMHOH I 40 50 60 70 80 90 100 1 Brightness Level a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. b) Interpret the slope in context. Russell should expect -0.0633 brightness level per hour. O Russell should expect -0.0633 hours per brightness level. c) What does the equation predict for the number of hours the phone will last at a brightness level of 88? hours d) What is the residual for the point (88, 3.3)? hours