1) P=2w +2l 
46=2w +14
32=2w
16= w or width
2) A=lw
A=7 x 12
A= 84
3) A= 12 x 21
A= 252
        
             
        
        
        
Answer: 
6: 12
7: 14
8: 16
Step-by-step explanation:
 You do the last (y) term given [18] minus the first (y) term [10] given divided by how many terms it takes to get from the last (y) term given minus the first (y) term given [4]. So the equation looks like this: 
(18 - 10)/4= 8/4 = 2
 
        
             
        
        
        
Answer:
Step-by-step explanation:
6/4=1.5 (price per can)
10/8=1.25 (price per can)
1.25 is cheaper than 1.5
the second one is the better buy
 
        
                    
             
        
        
        
Answer:
x > -4
Step-by-step explanation:
Inequalities like these are solved the same way equations are solved, except when multiplying both sides you flip the less than/greater than sign:
3x + 7 > -x -9
3x + 7 - 7 > -x -9 -7     Subtract 7 from both sides
3x > -x -16
3x + x > -x -16 + x     add x to both sides
4x > -16
 >
 >  divide both sides by 4
     divide both sides by 4
x > -4
In this case the inequality sign did not have to be flipped since we never multiply both sides by a negative number.