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Mathematical Applications for the Management, Life, and Social Sciences11th Edition

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Chapter 13.1, Problem 38E
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Mathematical Applications for the ...

11th Edition
Ronald J. Harshbarger + 1 other
ISBN: 9781305108042

Solutions

Chapter
Section
Problem 1CP
Problem 2CP
Problem 1E
Problem 2E
Problem 3E
Problem 4E
Problem 5E
Problem 6E
Problem 7E
Problem 8E
Problem 9E
Problem 10E
Problem 11E
Problem 12E
Problem 13E
Problem 14E
Problem 15E
Problem 16E
Problem 17E
Problem 18E
Problem 19E
Problem 20E
Problem 21E
Problem 22E
Problem 23E
Problem 24E
Problem 25E
Problem 26E
Problem 27E
Problem 28E
Problem 29E
Problem 30E
Problem 31E
Problem 32E
Problem 33E
Problem 34E
Problem 35E
Problem 36E
Problem 37E
Problem 38E
Problem 39E
Problem 40E
BuyFindarrow_forward

Mathematical Applications for the ...

11th Edition
Ronald J. Harshbarger + 1 other
ISBN: 9781305108042
Textbook Problem

Drug levels in the blood The manufacturer of a medicine wants to test how a new 300-mg capsule is released into the bloodstream. After a volunteer is given a capsule, blood samples are drawn every half hour, and the number of milligrams of the drug in the bloodstream is calculated. The results obtained are shown in the table.

Time t (hr) N(t) (mg) Time t (hr) N(t) (mg)
0 0 2.0 178.3
0.5 247.3 2.5 113.9
1.0 270.0 3.0 56.2
1.5 236.4 3.5 19.3

Use 7 rectangles, each with height N(t) at the left endpoint and with width 0.5 hr, to estimate the area under the graph representing these data. Divide this area by 3.5 hr to estimate the average drug level over this time period.

To determine

To calculate: The area under the graph using 7 rectangles each with the height N(t) measured at the left-handend points and with width 0.5 hr and divide the area by 3.5 hr to estimate the average drug level over this time period where the table represents the number of milligrams of the drug in the blood stream at 0.5 hr time periods.

Time t (hr) N(t)(mg)
0 0
0.5 247.3
1 270
1.5 236.4
2 178.3
2.5 113.9
3 56.2
3.5 19.3
Explanation

Given Information:

The provided table is,

Time t (hr) N(t)(mg)
0 0
0.5 247.3
1 270
1.5 236.4
2 178.3
2.5 113.9
3 56.2
3.5 19.3

Formula used:

The base of the rectangles to approximate the area is b−an where the interval [a,b] on which function is defined is divided into n subintervals.

The height of the rectangles is the value of the function calculated at the left-hand end point of the interval containing the base.

The area of a rectangle is baseĂ—height.

The approximated area under the curve is sum of the areas of each rectangle.

Calculation:

Consider the provided table,

Time t (hr) N(t)(mg)
0 0
0.5 247.3
1 270
1.5 236.4
2 178.3
2.5 113.9
3 56.2
3.5 19.3

Since, the table represents the corresponding values of y at various x.

Thus, the height of the function from 0 to 3.5 is 0, 247.3, 270, 236.4, 178.3, 113.9, 56.2 respectively.

The base of each rectangle is 0.5.

Recall that the height of the rectangles is the value of the function calculated at the left-hand end point of the interval containing the base.

Record these values in a table.

Rectangle Base left-hand end point Height Area=baseĂ—height
[0,0

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