Question

Answer 1

`c, -5/21 + (-16/21 + 1)`

`= -5/21 - 16/21 + 1`

`= -1 + 1`

`= 0`

Answer 2

`(-5)/21 + ( (-16)/21 +1)`

`= (-5)/21 + (-16)/21 + 1`

`=(-5)/21 - 16/21 + 1`

`= [ (-5)/21 - 16/21] + 1`

`= [ (-5-16)/21] + 1`

`= (-21)/21 + 1`

`=(-1) + 1`

`=0`

Answer 3

c) \(\dfrac{-5}{21}+\left(\dfrac{-16}{21}+1\right)\)

\(=\dfrac{-5}{21}+\dfrac{-16}{21}+1\)

\(=-1+1=0\)