Question

3. verify that - (-a)=a is true for the
following:
a=-19/21​

Answer 1

-(-a) = a

a=-19/21

-{-(-19/21)} = -19/21

-(19/21)=-19/21

-19/21=-19/21

L.H.S.= R.H.S

Answer 2

-(-a) =a

or, -(-19/20)

or,19/20

or, 0.95