Answer:
6/7 or .857
Step-by-step explanation:
Since they are both negative, it cancels each other and becomes positive
Answer:
3).

4).
If it was by 10, k = 3 by 10
k = 30
5).

Answer:
2pi?
Step-by-step explanation:
Pi is an irrational number so I guess double of pi would be irrational too.
2pi would be something like 6.28318531...