Question 645426
In 1970, Russia began drilling a deep borehole in the Kola Peninsula.
 Their goal was to reach a depth of 15km, but high temperatures in the hole
 forced them to stop in 1994 after reaching a depth of 12km.
 They found that below 3km the temperature increased 2.5 degrees Celsius
 for each additional 100m of depth.
If the temperature at 3km is 30 degrees Celsius and x is the depth of the
 hole in km, write an equation using x that will give the temperature in
 the hole at any depth below 3km.
:
2.5 degrees every 100 m, would be 25 degrees for every km
:
t(x) = 25x + 30
:
At what depth would they reach a temperature of 200 degrees Celsius?
25x + 30 = 200
25x = 200 - 30
25x = 170
x = 6.8 km below 3 km, temp would be 200 degrees