Add Rational Numbers on Number Line Practice Test

Carlos owes $$\18.50$$ on his lunch account, which can be represented as $$-18.5$$. His parents add money to his account in two deposits: first $$\12.75$$, then $$\8.25$$. Using the number line model for addition, what does his account balance become after both deposits?

A stock's value changes throughout the day. It starts at $$-\2.40$$ (meaning $$\2.40$$ below its opening price). The stock then has these changes: $$+\1.85$$, $$-\0.95$$, and $$+\0.75$$. Using number line addition, what is the stock's final position relative to its opening price?