Answer:
Speed = 19 mph
Explanation:
The speed of the ship is the slope of the line. Use these 2 points to find the slope: (0, 28) and (4, 104)
formula for slope: m = (y2 - y1) / (x2 - x1)
slope = (104 - 28) / (4 - 0) = 76/4 = 19
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