A paint company decided to test its durability of its white paint. They painted a square all white with their paint and measured the reflectivity of the square each year. Seven years after being painted, the reflectivity was 85%. Ten years after being painted, the reflectivity dropped to 82.9% Assuming that the reflectivity decreases steadily with time, write an equation that gives the reflectivity R (as a percentage) as a function of time t in years. What is the reflectivity of a fresh coat of white paint?

Question

Case Cochran

27 November, 16:30

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Maia Pittman · Answer 1

R = 89.9-0.7t

fresh coat has a reflectivity of 89.9 percent