Oil is pumped continuously from a well at a rate proportional to the amount of oil left in the well. initially there were 3 million barrels of oil in the well; six years later 1,500,000 barrels remain.

If is the amount of oil in the well (let's say in millions of barrels) at time

for some negative value of . You're told that the well started off with 3 million barrels, so , and that after 6 years, there are 1.5 million barrels, so .

Solve the differential equation above:



Integrate both sides.






Given that and , you have



So the amount of oil in the well is given by the function

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
hope this !