In the following problem, which step uses the additive identity to get to the next step?

-18 + 73 + 18
-18 + 18 + 73
0 + 73
73
step 1
step 2
step 3
step 4

Answer with Step-by-step explanation:

Step 1  -18 + 73 + 18

Replacing the places of 18 and 73

Step 2  -18 + 18 + 73

-18 is the additive inverse of 18

Hence, -18+18=0 where 0 is the additive identity

Additive inverse is used to get the next step.

Step 3    0 + 73

Adding 0 and 73 gives 73 since 0 is the additive identity

Additive identity is used to get the next step

Step 4   73

Hence, step which uses the additive identity to get to the next step is:

Step 3

Step 1  -18 + 73 + 18

Replacing the places of 18 and 73

Step 2  -18 + 18 + 73

-18 is the additive inverse of 18

Hence, -18+18=0 where 0 is the additive identity

Additive inverse is used to get the next step.

Step 3    0 + 73

Adding 0 and 73 gives 73 since 0 is the additive identity

Additive identity is used to get the next step

Step 4   73

Hence, step which uses the additive identity to get to the next step is:

Step 3

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.