Answer:
1. 
2. 
3. 3
4. -1 > x
Step-by-step explanation:
1.

2.

3. All share the factor of 3
4. Open circle is used for < (less than) or > (greater than). Shade to the right for > or ≥.
I hope this helps! May I please have brainliest? :)

1) Let's evaluate that expression, given that a=4.9, b=-7, and c=-0.5

Note that we have rewritten it as a fraction so that we can easily operate. Also, we have applied here the PEMDAS order of operations, prioritizing the exponents.
It can save time from doing number crunching and analysis because it's an easy to see visual.
Answer:
63
Step-by-step explanation:
A) 21(3)=n
B) 63