Moussa 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 Hours y 9 8 7 6 5 4 Hours 3 2 1 10 20 30 17 6 18 28 5 2 18 6 3 5 8 42 5 4 42 45 62 3 7 5 5 3 8 40 50 60 70 80 90 100 11 Brightness Level a What is the residual for the point 45 5 5 Round to 4 decimal places