Answer:
The amount of oil was decreasing at 69300 barrels, yearly
Step-by-step explanation:
Given


Required
At what rate did oil decrease when 600000 barrels remain
To do this, we make use of the following notations
t = Time
A = Amount left in the well
So:

Where k represents the constant of proportionality

Multiply both sides by dt/A


Integrate both sides


Make A, the subject

i.e. At initial
So, we have:






Substitute
in 

To solve for k;

i.e.

So:

Divide both sides by 1000000

Take natural logarithm (ln) of both sides


Solve for k



Recall that:

Where
= Rate
So, when

The rate is:


<em>Hence, the amount of oil was decreasing at 69300 barrels, yearly</em>
y=(-2x)+5
Step-by-step explanation:
Answer:
x ≤ 1/2
Step-by-step explanation:
1/2(4x - 2) - 2/3(6x + 9) ≤ 4
2x-1 - 4x+6 ≤ 4
2x-4x-1+6 ≤ 4
-2x + 5 ≤ 4
-5 -5
-2x ≤ -1
2x ≤ 1
2x/2 ≤ 1/2
x ≤ 1/2