Answer:
5.11811 inches 
Step-by-step explanation:
 
        
                    
             
        
        
        
20% of 55 is 
11Convert your percentage into a decimal: 

Multiply your decimal by 55:
 
 
        
        
        
Answer:
422 in.2
Step-by-step explanation:
Substitute the measurements of the rectangular prism into the formula SA = 2(lw) + 2 (lw) + 2(lh): 2(13)(7) + 2(6)(7) + 2(13)(6) = 422 in2. 
 
        
             
        
        
        
Answer:
10/3 days  or 3 1/3 days
Step-by-step explanation:
Let d = number of days total
75% of the days is 10
.75 d = 10
d = 10/.75
d = 40/3 days
We want to know how man is 25% of d
d * 25%
(40/3) *.25
10/3 days
 
        
             
        
        
        
Let's use the "elimination by addition/subtraction" method to solve this system for x and y.
<span> -8x=72-16y             
4x=-92+16y        <= Mult. all 3 terms by 2:          8x = - 184 + 32y
Now combine the following, column by column:
</span><span> -8x=       72-16y
</span>8x = - 184 + 32y
-----------------------
   0 = -112 + 16y.  Solving for y, 16y = 112, and y = 7.
Now subst. 7 for y in either of the original equations and calculate x:
<span>4x=-92+16(7)   =>   4x = -92 + 112  =  20.  Then x = 5.
Solution is 5, -7   (or, better written) (5, - 7).</span>