Answer Happy

Isaac 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. ca Brightness Level (x) Hours (y) 20 39 53 6.7 4.5 5.6 55 56 4.2 4.2 59 84 91 3.7 2.6 3.1 10+ 8 • 0 Hours 2 1 70 80 100ų 10 20 30 40 50 60 90 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. O Isaac should expect -0.0514 brightness level per hour. Isaac should expect -0.0514 hours per brightness level.

b) Interpret the slope in context. O Isaac should expect -0.0514 brightness level per hour. Isaac should expect -0.0514 hours per brightness level. c) What does the equation predict for the number of hours the phone will last at a brightness level of 53? hours d) What is the residual for the point (53,5.6)? hours