On Friday, Debby borrowed $10 from
her sister. The next day, she paid
back $5 to her sister. On Monday, she
borrowed $4 more. Which number
sentence describes the amount Debby
owes her sister?
A.-10 + 5 + -4 = 9
B.10-5 + -4 = -1
C.-10 + 5--4 = -1
D.10+ -5 + -4 = 1