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Henry is investigating how long his phone s battery lasts in hours for various brightness...

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Henry 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 8 7 6 5 Hours WA C H Brightness Level x 20 56 58 61 63 64 72 83 Hours y 4 5 5 1 3 9 4 5 3 4 3 9 3 7 2 10 20 30 40 50 60 70 80 90 100 110 Brightness Level a Find the equation for the line of best fit Keep at least 3 decimals for each parameter in the equation b Interpret the slope in context Henry should expect 0 0327 brightness level per hour Henry should expect 0 0327 hours per brightness level

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