Question

 

 

Answer 1

a) \(\left(-28\right)+\left(-35\right)-92+\left(-82\right)\)

\(=-28-35-92-82\)

\(=-237\)

b) \(15-\left(-38\right)+\left(-55\right)-47\)

\(=15+38-55-47\)

\(=-49\)

Answer 2

a) \(31+32+33+34+35-11-12-13-14-15\)

\(=\left(31-11\right)+\left(32-12\right)+\left(33-13\right)+\left(34-14\right)+\left(35-15\right)\)

\(=20+20+20+20+20\)

\(=20.5\)

\(=100\)