Answer:
D.-30+(-70)+(-40)
Step-by-step explanation:
Given expression,
-30+(-40)+(-70)
= -30-40-70
= - 140
In option A,
30+40+70 = 140 ≠ -140,
In option B,
-30-(40-70) = -30 - (-30) = -30 + 30 = 0 ≠ -140,
In option C,
-(30-40)+(-70) = -(-10) - 70 =10 - 70 = -60 ≠ -140,
In option D,
-30+(-70)+(-40) = -30-70-40 = -140