The function T given by Td 10d 20 can be used to determine

The function T given by T(d) = 10d + 20 can be used to determine the temperature T in degrees Celsius, and a depth d in kilometers inside of the earth. Find the temperature T(5), T(20) and T(1000)

Solution

T(d) = 10d + 20

T(5) = 10*5 + 20 = 70 °C

T(20) = 10 * 20 + 20 = 220 °C

T(1000) = 10*1000 + 20 = 10020 °C