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I am so sorry , I have written everything solved everything but cannot send so many photos
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Answer:
(a) (-13)×(-28)+(-72)×(-13)
= 364 + 936
= 1300
(b) 36.54 - 15.79 + 85.2 - 57.-615
= 20.75+27.585
= 48.335
(c) GIVEN : a = -2,b = 1,c = -2,x =4, y =-1,z = 2
= ax2 +by2 -cz2
= -2 × 4×4 +1×-1×-1 - (-2)×2×2
= -2×16+1×1 +2×4
= -32 +1+8
= -32+9
= -23
(d) WE KNOW THAT THE FORMULA OF RECTANGLE 'AREA = LENGTH × BREADTH
GIVEN : LENGTH = 17 1/2 AND BREADTH = 12 1/2
THIS IS TRICK QUESTION WE HAVE TO MULTIPLY 17×2 AND IT 1
SO IT'S BECOME 35/2
ALSO LIKR THIS WE HAVE TO MULTIPLY 12 × 2. AND IT 1
SO IT'S BECOME 25/2
BY THE FORMULA,
AREA = LENGTH × BREADTH
AREA OF RECTANGULAR TABLE = 35/2 × 25/2
=(17.5 × 12.5)m
AREA OF RECTANGULAR TABLE = 218.75 m2
I HOPE THIS WILL HELPFUL TO YOU
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