Developmental Mathematics (9th Edition)
9th Edition
ISBN: 9780321997173
Author: Marvin L. Bittinger, Judith A. Beecher
Publisher: PEARSON
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Chapter A, Problem 21DE
To determine
To fill: The blank in the statement, “A book is 3_____ thick.”
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An open-top rectangular box is being constructed to hold a volume of 150 in³. The base of the box is made
from a material costing 7 cents/in². The front of the box must be decorated, and will cost 11 cents/in².
The remainder of the sides will cost 3 cents/in².
Find the dimensions that will minimize the cost of constructing this box. Please show your answers to at
least 4 decimal places.
Front width:
Depth:
in.
in.
Height:
in.
Find and classify the critical points of z = (x² – 8x) (y² – 6y).
Local maximums:
Local minimums:
Saddle points:
-
For each classification, enter a list of ordered pairs (x, y) where the max/min/saddle occurs. Enter DNE if
there are no points for a classification.
Chapter A Solutions
Developmental Mathematics (9th Edition)
Ch. A - Use the unit below to measure the length of each...Ch. A - Prob. 2DECh. A - Prob. 3DECh. A - Prob. 4DECh. A - Prob. 5DECh. A - Prob. 6DECh. A - Prob. 7DECh. A - Prob. 8DECh. A - Prob. 9DECh. A - Prob. 10DE
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