Alexa is balancing her checkbook before she leaves for college. she began with an account balance of $83. she deposited the $1200 that she earned from her summer job. she used her debit card to purchase a plane ticket back to college for $896. going online, she was able to purchase all of her textbooks for $272. then she put $115 into her meal account. what is the current balance in alexa’s checking account?