Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - Summary Exercises - Operations with Signed Numbers: 52

Answer

The missing values (a negative value means a loss) in the table (from top to bottom) are: \begin{array}{ccccccccc} &-\$700 \\&-\$100 \\&\$700 \\&\$900 \\&\$0 \\&\$700 \end{array}

Work Step by Step

The profit or a loss for each month can found by subtracting the expenses from the income. However, since the expenses in the table are represented by negative numbers. then to find the profit or loss, the expense will be added to the income. Thus, the profit or loss (a negative value means a loss) for each month is: \begin{array}{ccccccccc} &\text{January:} &\$2400 + (-\$3100) = &-\$700 \\&\text{February:} &\$1900 + (-\$2000) = &-\$100 \\&\text{March:} &\$2500 + (-\$1800) = &\$700 \\&\text{April:} &\$2300 + (-\$1400) = &\$900 \\&\text{May:} &\$1600 + (-\$1600) = &\$0 \\&\text{June:} &\$1900 + (-\$1200) = &\$700 \end{array} Thus, the missing values in the table (from top to bottom) are: \begin{array}{ccccccccc} &-\$700 \\&-\$100 \\&\$700 \\&\$900 \\&\$0 \\&\$700 \end{array}
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