In drilling world’s deepest hole, the Kola Superdeep Borehole, the deepest manmade hole on Earth and deepest artificial point on earth, as a result of a scientific drilling project, it was
found that the temperature T in degree Celsius, x km below the surface of earth, was given
by:
T = 30 + 25(x -3), 3 < x < 15.
If the required temperature lies between 200℃ and 300℃, then
i the depth, x will lie between
a. 9 km and 13 km
b. 9.8 km and 13.8 km
c. 9.5 km and 13.5 km
d. 10 km and 14 km
ii Solve for x: -9x+2 > l8 OR 13x+15 ≤ -4
a. x < -19/13
b. x < -16/13
c. -16/13 < x < -19/13
d. There are no solution.
iii. Find the inequality represented by the graph
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