Plotting a graph and then find the function value.
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The electrical resistance R (in ohms) of a resistor is measured at different temperatures T (in Celsius). The results are in the following table.
Plot the graph of R=f(T), and use the graph to find f(22).
T (Celsius) 0 5 10 15 20 25
R (Ohms) 600 620 635 640 650 670
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