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40) . 6x + y + [(-12x) +3y ]= -6x +4y
41). a) x^2.y^2.z^2
b)-a^6
c)60a^4b^4
d) 9a^2- b^2
42) A solid figure consisting of four or more plane faces (all polygons), pairs of which meet along an edge, three or more edges meeting at a vertex.
43) area of border = (l + b +2w)2w
= (500+75+12)×12 = 7044cm^2
here l= length, b= breadth, w = width of lace
cost = 7044×0.50 = 3522
44) let the rational constant = x
912 = 1/2( 6x+13x) 24 = 1/2 .19x.24
x = 4
parallel sides = 24 & 52
45) lateral s.a of cuboid = 2(l+b).h
= 2 (8+5.2).6 = 158.4
46) TSA of cylinder=2pie r (r+h)
TSA=968
2*22/7*7(7+h)=968
2*22(7+h)=968
(7+h)=968/44
7+h=22
h=22-7
=15 cm
HEIGHT OF CYLINDER=15CM.
47) vol of cylindrical can = πr^2h
= 22/7×21×21×8
= 25872 cm^3
Hope it helps
41). a) x^2.y^2.z^2
b)-a^6
c)60a^4b^4
d) 9a^2- b^2
42) A solid figure consisting of four or more plane faces (all polygons), pairs of which meet along an edge, three or more edges meeting at a vertex.
43) area of border = (l + b +2w)2w
= (500+75+12)×12 = 7044cm^2
here l= length, b= breadth, w = width of lace
cost = 7044×0.50 = 3522
44) let the rational constant = x
912 = 1/2( 6x+13x) 24 = 1/2 .19x.24
x = 4
parallel sides = 24 & 52
45) lateral s.a of cuboid = 2(l+b).h
= 2 (8+5.2).6 = 158.4
46) TSA of cylinder=2pie r (r+h)
TSA=968
2*22/7*7(7+h)=968
2*22(7+h)=968
(7+h)=968/44
7+h=22
h=22-7
=15 cm
HEIGHT OF CYLINDER=15CM.
47) vol of cylindrical can = πr^2h
= 22/7×21×21×8
= 25872 cm^3
Hope it helps
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