Question: The function T given by T(d) = 10d + 20 can be used to determine the temperature T, in degrees Celsius, at a depth d,

The function T given by T(d) = 10d + 20 can be used to determine the temperature T, in degrees Celsius, at a depth d, in kilometers, inside the earth.
(a) Find T(5), T(20), and T(1000).
(b) The radius of the earth is about 5600 km.
Use this fact to determine the domain of the function.

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