t (min) 5 10 15 20 25 30 V (gal) 694 444 250 111 28 0   A. If P is the point (15, 250) on the graph of V, find the slopes of the secant lines PQ when Q is the point on the graph with t = 5, 10, 20, 25, and 30.   B. Estimate the slope of the tangent line at P by averaging the slopes of two secant lines.​

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 94E
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A tank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. The values in the table show the volume V of water remaining in the tank (in gallons) after t minutes.

 

t (min)

5

10

15

20

25

30

V (gal)

694

444

250

111

28

0

 

A. If P is the point (15, 250) on the graph of V, find the slopes of the secant lines PQ when Q is the point on the graph with t = 5, 10, 20, 25, and 30.

 

B. Estimate the slope of the tangent line at P by averaging the slopes of two secant lines.​
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