$\"\"$

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(a)

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The dry adiabatic lapse rate of $\"\"$ per $\"\"$ feet.

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Thr ground temperature is $\"\"$ .

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The temperature of a paracel at $\"\"$ feet is $\"\"$

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The first term is $\"\"$ .

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Each v feet, the temperature reduces by $\"\"$ , hence $\"\"$ .

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Hence the sequence is $\"\"$ .

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Find the temperature for $\"\"$ thousand feet.

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The formula for $\"\"$ term: $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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(b)

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Find the temperature of the parcel at $\"\"$ feet.

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The temperature for $\"\"$ thousand feet is $\"\"$ .

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For $\"\"$ feet: $\"\"$ .

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$\"\"$

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$\"\"$ .

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Therefore, the temperature of the parcel at $\"\"$ feet is $\"\"$ .

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$\"\"$

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(a) The temperature for $\"\"$ thousand feet is $\"\"$ .

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(b) The temperature of the parcel at $\"\"$ feet is $\"\"$ .