20 !
you made two deposits to your bank account this month. one deposit was $17.92, and the second deposit was $15.33. your balance at the end of the month is $72.31, and you made no withdrawals. write and evaluate an expression for your balance at the beginning of the month.
$72.31 – $17.92 – $15.33; $39.06
$72.31 + $17.92 + $15.33; $105.56
$72.31 + ($17.92 – $15.33); $74.90
$72.31 – ($17.92 – $15.33); $69.72