In one study the efficiency of photosynthesis in an Antarctic species of grass was investigated. The table

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In one study the efficiency of photosynthesis in an Antarctic species of grass was investigated. The table lists results for various tem- peratures. The temperature x is in degrees Celsius and the efficiency y is given as a percent.image


(a) Plot the data. Discuss reasons why a quadratic function might model the data. 


(b) Find a least-squares quadratic function f given by f(x) = ax+ bx + c that models the data. 


(c) Graph f and the data in the window [-5, 35, 5] by [20, 110, 10]. Discuss the fit. 

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