The production levels of coffee in Mexico, Q (in suitable units) depends on the average summer temperature, T (in °C). A statistical model of recent data shows that Q = −0.046T2 + 2.3T + 27.6.
(a) Complete the table of values and draw a graph of Q against T in the range, 23 ≤ T ≤ 30.(b) Average summer temperatures over the last few decades have been about 25°C. However, some climate change models predict that this could rise by several degrees over the next 50 years. Use your graph to comment on the likely impact that this may have on coffee growers in Mexico.

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30 24 25 26 28 29 23 27