Final answer:
To represent Yoko's withdrawal of 140 dollars from her account, the signed number is -140, which signifies a decrease in her checking account balance.
Step-by-step explanation:
When Yoko withdrew 140 dollars from her checking account, this transaction is represented by a negative number because it decreases the balance in her account. Therefore, the signed number to represent this charge would be -140. This follows the convention in accounting and finance, where withdrawals or expenses are labeled with negative numbers.
To represent the charge of $140 in Yoko's checking account, we use a signed number. In this case, since Yoko withdrew money from her account, we use a negative sign to indicate a decrease in her balance. So, the signed number to represent this charge is -140.When Yoko withdrew 140 dollars from her checking account, this transaction is represented by a negative number because it decreases the balance in her account. Therefore, the signed number to represent this charge would be -140. This follows the convention in accounting and finance, where withdrawals or expenses are labeled with negative numbers.