In drilling world's deepest hole it was found that the temperature t in degree celcius, x km below the earth's surface was given by t = 30 + 25 (x – 3), 3 ≤ x ≤ 15. at what depth will the temperature be between 155°c and 205°c?
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t = 30 + 25(x-3)
155 = 30 +25(x-3)
(155-30)/25 = x-3
x = 5+3 = 8 km
t = 205
205 = 30 +25(x-3)
(205-30)/25 = x-3
x = 7+3 = 10 km
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