Answer:
-63
Step-by-step explanation:
 
        
             
        
        
        
Answer:
DA/dt  = 75.27 cm²
Step-by-step explanation:
Cube Volume    =   V(c)   =  683  cm³
DV(c) /dt    =  824 cm³
V(c,x) = x³    
Then
 DV(c,x)/ dt   =  3x² Dx/dt
( DV(c,x)/ dt )/ 3x²  =  Dx/dt       (1)
Now  as  V(c,x) = x³    when    V(c,x)  =  683 cm³     x = ∛683
x  =  8.806     ( from excel)
And by subtitution of this value in equation (1)
 Dx/dt   =  ( DV(c,x)/ dt )/ 3x²   ⇒  Dx/dt  =  824 / 3*x² 
   Dx/dt   = 824 /3*77.55
 Dx/dt   =  824/232,64
 Dx/dt   = 3,542
Then we got  Dx/dt  where x is cube edge. The area of the face is x² then
the rate of change of the suface area is  
DA/dt  = ( Dx/dt )²*6         ( 6 faces of a cube)
DA/dt  = (3.542)²*6
DA/dt  = 75.27 cm²
 
        
             
        
        
        
A.32 it’s not very complicated you just have to find the value of A and B then multiply them together
        
             
        
        
        
Set up a system of equations.
l=4w
2l+2w=110
Substitute l in to the second equation.
2(4w)+2w=110
8w+2w=110
10w=110
w=11
Substitute w back into the first equation.
l=4(11)=44
So, the length is 44 feet and the width is 11 feet.
Hope this helped!