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The graph models the total charge for a courier trip. \(d\) is measured in km, and \(C\) is measured in $

The model's domain is \(0 \le d \le 7\). The graph uses unit gridlines in the stated axis units

Cartesian graph with horizontal axis Distance (km) and vertical axis Total charge ($). The window is x from -2 to 8 and y from 20 to 44, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 26) to (7, 40). Marked points: P is (1, 28), Q is (3, 32), R is (4, 34).-2024682124273033363942PQRmodelDistance (km)Total charge ($)
1 mark

What is the constant rate of change?