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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem

Water flows into and out of a storage tank. A graph of the rate of change r(t) of the volume of water in the tank, in liters per day, is shown. If the amount of water in the tank at time t = 0 is 25, 000 L, use the Midpoint Rule to estimate the amount of water in the tank four days later.

To determine

To estimate:

The amount of water in the tank four days later by using the Midpoint Rule.

Explanation

1) Concept:

Use the Net Change theorem and the Midpoint Rule.

2) Theorem:

The integral of a rate of change is the net change.

abF'(x)dx=Fb-F(a)

3) Given:

The amount of water in the tank at t=0 is 25,000 L.

4) Calculation:

Initially, 25,000 L water is present in the tank.

Therefore, by the Net Change theorem, the amount of water in the tank four days later is given by

=25000+04r(t)dt

Find 04r(t)dt by using the Midpoint Rule.

With n=4, a=0 and b=4 interval width is

t=b-an

Substitute values.

t=4-04

t=1

And the midpoints are

t1-=12t0+t1=120+1=121=0.5

t2-=12t1+t2=121+2=123=1.5

t3-=12t2+t3=122+3=125=2

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