Answer: A.
Step-by-step explanation: yes
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Subtract first from second 
= 2x^2 + 3x + 5
 
        
             
        
        
        
(a) I'd say sometimes true. 3 + -7= -4 , -5 + 3= -2 , 8+-5=3, 7+-7=0
(b)  I'm not too sure about this one but I what i know is that if the positive number is higher than the negative number it will be a positive. If you are adding both a negative number and a positive number that is the same value it will be 0. And if you are adding a negative that is higher than the positive it will be a negative number. 
I hope this helped a bit.. (: 
        
             
        
        
        
Answer:
2/5 of an acre
Step-by-step explanation:
1/2 an acre, or 5/10 of an acre, is subtracted from 9/10 of an acre
4/10 can be simplified into 2/5 if divided by two