Writing linear functions word problems

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Mr. Mole left his burrow that lies below the ground and started digging his way deeper into the ground, descending at a rate of 1.81.8 meters per minute. After 55 minutes, he was 13.513.5 meters below the ground.
Let A(t)A(t) denote Mr. Mole's altitude relative to the ground AA (measured in meters) as a function of time tt (measured in minutes).
Write the function's formula.
A(t)=A(t)=