Question

please give right answers....
Because this question is of 100 marks...​

Answer 1

Answer:

Q1 a)X= -21/31

-(-X)=-[-(-21/31)]

-x=-21/31

b) x=11/15

-(-x)=-[-(11/15)]

-x=11/15

Q2

2/5*3/7-1/4-3/7*3/5

= -47/140

Q3 a) 5/9

b) -6/5

c)2/9

d)19/6

Q4 a)commutative property

b)associative property

Q5 -4/5*3/7*15/16*-15/9

=15/28

Step-by-step explanation:

Answer 2

1) (a) x = -21/31

         -x = 21/31

         -(-x) = -21/31

Hence , x =-(x)

(b) x = 11/15

-x = -11/15

-(-x) = 11/15

Hence x = -(-x)

2) 2/5 * -3/7 = -6/35 = -12/70

-3/7 * 3/5 = -9/35 = -18/70

-1/14 = -5/70

Hence,

2/5 * -3/7 - 1/14 - 3/7 * 3/5

= -12/70 - 5/70 - 18/70

= (-12-5-18)/70

= -35/70

= -1/2

3) (a) 5/9

(b) -6/5

(c) 2/9

(d) 19/6

4)

(a) Commutative property

A * B = B * A

(b) Associative property

A * (B*C) = (A*B) * C

5)

-4/5 * 3/7 * 15/16 * -15/9

= -4/16 * 15/5 * 3/9 * -15/7

= -1/4 * 3 * 1/3 * -15/7

= 15/28

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