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Algebra & Trigonometry with Analytic Geometry

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter4: Polynomial And Rational Functions

Section: Chapter Questions

Problem 5T

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Question

(c) Use a calculator to verify that .
`x = 5805, x² = 5,621,655, v = 560, y? = 61,492 and xy = 535,058.
Compute r. As x increases, does the value of r imply that y should tend to increase or decrease? Explain your answer.
First, we construct a computation table so that we can calculate the values of x², y', and xy. Then we sum each column to
compute each summation.
y
v2
ху
1004
1600
40,160
97,500
64,480
135,575
40
1,008,016
950,625
984,064
874,225
975
100
10,000
4225
992
65
935
145
21,025
978
69
956,484
4,761
921
141
848,241
19,881
129,861
Σ
Ex² =
x = 5805
Sy = 560
xy =

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