Question

8. - (515 - 80 + 90) - (2005 + 80 - 91)

9. 880 - (3330 - 220 + 70)

Answer 1

8. \(-\left(515-80+90\right)-\left(2005+80-91\right)\)
\(=-525-1994\)
\(=-2519\)

9. \(880-\left(3330-220+70\right)\)
\(=880-3180\)
\(=-2300\)

Answer 2

`8. - (515 - 80 + 90) - (2005 + 80 - 91)`

= -(435 + 90) - ( 2085 - 91)`

`= -525 - 1994`

`= -2519`

`9. 880 - (3330 - 220 + 70)`

`= 880 - (3110 + 70)`

`= 880 - 3180`

`= -2300`

Answer 3

`8. - (515 - 80 + 90) - (2005 + 80 - 91)`

`=- 515 + 80 - 90 - 2005 - 80 + 91`

`=-515+(80-80)+(-90+91)-2005`

`=-515+0+1-2005`

`=-514-2005`

`=-2519`

`9. 880 - (3330 - 220 + 70)`

`=880 - 3330 + 220 - 70`

`=(880-70)+(-3330+220)`

`=810-3110`

`=-2300`