Lynn begins with a bank balance of $64. After three checks are written, the amount now has a balance of $-13. What was the total amount of checks?

Carli has 90 apps on her phone. braylen has half the amount of apps as theiss. if carli has three timesthe amount of apps as theiss,how many apps does braylen have? let b represent the number of braylen's apps and t represent the number of theiss's apps.