Question

Answer 1

\(3+\left(-5\right)+7+\left(-9\right)+11+\left(-13\right)+15+\left(-17\right)\)

\(=\left(-13+3\right)+\left(15-5\right)+\left(-17+7\right)+\left(11-9\right)\)

\(=\left(-10\right)+10+\left(-10\right)+2\)

\(=\left(-10\right)+2\)

\(=-8\)

Answer 2

3 + (-5) + 7 + (-9) +11 + (-13) +15 + (-17)

= [ 3 + (-13)] + [(-5) + 15] + [ 7 + (-17)] + [(-9) + 11]

= (-10) + 10 + (-10) + 2 = 0 + (-10) + 2 = (-10) + 2 = -8