Answered: Two specimens of cold rolled steel…

College Algebra (MindTap Course List)

12th Edition

ISBN:9781305652231

Author:R. David Gustafson, Jeff Hughes

Publisher:R. David Gustafson, Jeff Hughes

Chapter4: Polynomial And Rational Functions

Section4.6: Rational Functions

Problem 11SC: Find the mean hourly cost when the cell phone described above is used for 240 minutes.

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Question

Two specimens of cold rolled steel sheet, which have different
copper contents and annealing temperature are measured in hardness with the following results:

First column = Hardness
Second column = Copper content
Third column = Annealing temperature

a) Fit an equation of the form (image 2), where x1 represents the copper content, x2 represents the annealing temperature, and y represents the hardness.

b) Estimate the hardness of a steel sheet with a copper content of 0.05% and an annealing temperature of 1150 ° F.

Dureza (Rockwell 30-T)
Contenido de cobre (%)
Temperatura de recocido
(°F)
78.9
0.02
1000
65.1
0.02
1100
55.2
0.02
1200
56.4
0.02
1300
80.9
0.10
1000
69.7
0.10
1100
57.4
0.10
1200
55.4
0.10
1300
85.3
0.18
1000
71.8
0.18
1100
60.7
0.18
1200
58.9
0.18
1300

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