The area of the surface is 144.708
The equation of the given surface is,
z=g(x,y)=xy
Solving the partial derivatives,
∂g∂x=y,∂g∂y=x
Substituting to the formula 
S=∬√1+( ∂g∂x)2+(∂g∂y)2dA
Thus,
S=∬√1+(y)2+(x)2dAS=∬√1+x2+y2dA
The region in the XY-plane is defined by the intervals  0≤θ≤2π,0≤r≤4
Converting the integral into polar coordinates,
S=∫2π0∫40√1+r2rdrdθ
Integrating with respect to r
S=∫2π0[13(1+r2)32]40dθ
S=∫2π0(17√173−13)dθ
Integrating with respect to θ
S=(17√173−13)[θ]2π0
S≈144.708
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N = 273 
273 / 7 = 39 
Dividend / divisor = quotient 
Work Backwards:
n/7 = 39 
 n = 39 X 7 
 n = 273
        
             
        
        
        
Answer:
Step-by-step explanation:
The sum of the angles is ...
   x° + (x +8)° + 2x° = 180°
   4x +8 = 180 . . . . . . . . . . . collect terms, divide by °
   x +2 = 45 . . . . . . . . . . divide by 4
   x = 43 . . . . . . . . . . subtract 2
   x +8 = 51
   2x = 86
The angles are 43°, 51°, 86°.
 
        
             
        
        
        
Sub the number in 
19 + 4(4) 
= 19 + 16 
= 35 
multiplication is first because of bedmas
        
                    
             
        
        
        
Answer:
what are solving it with??