Can u pls help me answer iii ,iv and v

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V = x^3 +x^2 - 4x - 4
 Base = ( x+ 1) * ( x + 2)
Height = V / Based  =  x^3 +x^2 - 4x - 4 / ( ( x+ 1)  ( x + 2) )  
=  x^3 +x^2 - 4x - 4 / x^2 +3x + 2
= x -2 
 
ii) x = 4 thus volume =  x^3 +x^2 - 4x - 4 =  4^3 + 4^2  -4*4 - 4 = 64 +16  - 16  -4 = 60 

iii) area of inner portion is 2( b*h + l*h  + l*b )
l = x+1 b = x+2 h = x -2 
x =4 
thus l,b,h = 5,6,2
area to paint is 2*(6*2 + 5*2 + 5*6 ) =  2*52 = 104 m^2
thus none of the above

iv)  Cost of painting 104 *25 = Rs 2600

v) Volume = 60 m^3 = 60000 L
 
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