Answer: 441
Step-by-step explanation:
21 x 21 = 441
Assignment: 
<><><><><>
Answer: 
<><><><><>
Explanation: 
<><><><><>
Note: 
[ Step One ] Apply Rule - (-a) = a

[ Step Two ] Add

<><><><><><><>
slope intercept form equation, y = mx + b
answer, y = -2x + 4
Answer:
3547.90
Step-by-step explanation:
Answer:
1st is valid 2nd is not valid
Step-by-step explanation: