Answer: She can only buy 1 snack
Step-by-step Step-by-step explanation: All right, but because she had 18 bucks at first, write it down. You'd write down $18 and then spend $6.50 on a notebook for Andrea. Write it down too. But now you're going to make $18 - $6.50. That's equivalent to $11.50. Andrea, however, has to save $5.75. so, deduct it from the $11.50 that you wrote $6.50. Write $18-$6.50=$11.50 Okay, but now that you have written down $11.50, deduct 5.75 (for Andrea's savings) and then $11.50 - $5.75 = $5.75. She's only gonna buy one snack