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In the context of this scenario, h(10) represents the altitude of the hot air balloon after 10 minutes of flying. To find the value of h(10), you simply substitute t = 10 into the function h(t) and solve for the altitude.
h(10) = 210 - 15(10)
h(10) = 210 - 150
h(10) = 60
Therefore, after 10 minutes of flying, the altitude of the hot air balloon would be 60 meters.