Betty had $70. She bought a necklace for $9 and a ring for $7. Which expression correctly shows the total money Betty has left? A $70 − (−$9) + (−$7) B $70 + (−$9) + (−$7) C $70 − (−$9) − (−$7) D $70 + (−$9) − (−$7) A B C D

B is the correct answer.
This is because the numbers in the parentheses have a negative sign in front of them. If you have an equation that "subtracts" a negative number, the sign would change to the opposite and you would have to add. To avoid that, you have to put an addition sign to subtract correctly.
✅70+(-9)+(-7)=70-9-7
❌70-(-9)-(-7)=70+9+7