Question

What property justifies Step 2 in the following problem:
Step 1: 10 [15 + (-45) ÷ 3] + 9 • 1
Step 2: 10 [15 + (-15)] + 9• 1
Step 3: 10 (0) + 9 • 1
Step 4: 10 + 9 • 1
Step 5: 10 + 9
Step 6: 19

Answer 1

Answer:

I think it is BODMAS

Step-by-step explanation:

In the 4th step it will be 0+9 as 10(0)=0

so step 5 will be 9

Thus the answer will be 9 and not 19