Answer:
21
Step-by-step explanation:
3^2=9
9+12=21
Keep it up
 
        
             
        
        
        
Answer:
|-45|
Step-by-step explanation:
In mathematics, the absolute value of a real number is the numeric value of the  number, regardless the sign, either this is positive or negative.
The absolute value function can be definied as: 
- |a|=a si a ≥0
- |a|=-a si a <0
 Using this definition, we have:
|-21| = -(-21) = 21
|14| = 14
|30| = 30
|-45| = -(-45) = 45
Therefore, the expression |-45| has the greatest value.
 
        
             
        
        
        
Answer:
16x 
Step-by-step explanation:
2x^2(x+3)
2 times 2 = 4
4x(x+3)
4x + 12x =
16x
 
        
             
        
        
        
Answer:
w > 7
Step-by-step explanation:
L = 3w
2L + 2w > 56
sub for L
2(3w) + 2w > 56
6w + 2w > 56
8w > 56
w > 7
Check: L = 3(8)
L = 24
2(24) + 2(8) > 56
48 + 16 > 56
64 > 56
 
        
                    
             
        
        
        
   2+      0.0+      0.05+	0.009okay so you just have to add the numbers. so you add 2+0.0+0.5+0.009. then you will get you answer. i hope this helps!!!!