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The graph models the total charge for a plumber's visit. \(h\) is measured in hours, and \(C\) is measured in $

The model's domain is \(0 \le h \le 6\). The graph uses unit gridlines in the stated axis units

Cartesian graph with horizontal axis Use time (hours) and vertical axis Total charge ($). The window is x from -1 to 7 and y from 32 to 54, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 37) to (6, 49). Marked points: P is (2, 41), Q is (4, 45), R is (5, 47).-101234567323436384042444648505254PQRmodelUse time (hours)Total charge ($)
1 mark

Calculate the slope and state its contextual unit