III. Answer the following: 11)Arrange 5/9,-5/6,-7/-12,-13/24 in descending order.
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12) Verify associative property of addition (x + y) + z = x + (y + z) for the given values of X = -12, y = -9/11, z = 7/-12
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13) If a person cuts a 15cm long piece of paper into 5mm segments and also cuts a 5cm long piece of paper into 1mm segments. What will be the difference in the number of cuts made to each piece of paper?
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15) Simplify (5^-1 ÷ 4^-1)^2 x (4/3)^-1
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16) By which number should (-3/8)^-2 be divided to get 21/-25
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17) Calculate and express your answer in scientific notation: (4.5 x 10^4) x (5.2 x 10^3)
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18) Using prime factorisation, find out whether 495616 is a perfect square or not?
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