For this case we must simplify the following expression:

We must add similar terms taking into account that:
- Equal signs are added and the same sign is placed.
- Different signs are subtracted and the major sign is placed.

Thus, the simplified expression is:

Answer:

Answer:
i think is D
Step-by-step explanation:
because 2×7=21
3×21=63
and the parent still going
0.9x12=10.8,, 10.8-6.3=4.5. The number is 12
Answer:
16/81
Step-by-step explanation:
as there is (-) sign so when we multiply even negative numbers it becomes positive