Final answer:
To translate 'take away 15 dollars from the balance in the checking account' into a variable expression, use b - 15.
Step-by-step explanation:
To translate the phrase 'take away 15 dollars from the balance in the checking account' into a variable expression using the letter b as the variable, we can use the subtraction operation (-). The variable b represents the balance in the checking account. So, the variable expression would be b - 15.
Learn more about Variable expression in mathematics