2/5 is equivalent to 4/10 so at the end of February 4/10 was used up
And at the end of January, 3/10 was used 
so 4/10 + 3/10 = 7/10
At the end of February, 7/10 of the wood was used
        
             
        
        
        
Answer:
8+8+8+8+8+8+8+8+8. 
Step-by-step explanation:
Just add 8 nine times.
 
        
                    
             
        
        
        
Answer:
Let's solve for x.
4x−2y=20
Step 1: Add 2y to both sides.
4x−2y+2y=20+2y
4x=2y+20
Step 2: Divide both sides by 4.
4x/4
=  2y+20/4
x=  1/2y+5
Answer: x=  1/2y+5
 
        
             
        
        
        
Question 3. the answer is 18
4. the answer is 3x+3y