9+(-10)+11+(-12)+13+(-14)+15+(-16)
=[9+(-10)]+[11+(-12)]+[15+(-16)]
= -1 +(-1) + (-1)
=-3
9+(-10)+11+(-12)+13+(-14)+15+(-16)
= [ 9 + ( - 10 ) ] + [ 11 + ( - 12 ) ] + [ 13 + ( - 14 ) ] + [ 15 + ( - 16 ) ]
= ( - 1 ) + ( - 1 ) + ( - 1 ) + ( - 1 )
= ( - 1 ) x 4
= - 4
\(9+\left(-10\right)+11+\left(-12\right)+13+\left(-14\right)+15+\left(-16\right)\)
\(=\left[9+\left(-10\right)\right]+\left[11+\left(-12\right)\right]+\left[13+\left(-14\right)\right]+\left[15+\left(-16\right)\right]\)
\(=-1+\left(-1\right)+\left(-1\right)+\left(-1\right)\)
\(=-4\)