Question

a, 20 - ( -40 ) + 10 b, -21 + ( -13 ) - 4 c, ( 3 - 23 ) - ( 4 - 10 ) d, ( -8 + 15 ) - ( -6 - 20 )

Answer 1

a) 20- ( -40 ) +10 b) - 21+ ( -13 ) -4

= ( 40+ 20 ) +10 = - ( 21+13 )- 4

= 60+ 10 = ( -34 ) - 4

= 70 = - ( 34+ 4 )

= - 38

c) ( 3-23 ) - ( 4- 10 ) d) ( -8 + 15 ) - ( -6-20)

= ( - 20 ) - ( -6 ) = 7+ - 26

= - ( 20+ 6 ) = -19

= - 26

Answer 2

b: =-21-13-4=-34-4=-38

d: =-8+15+6+20=7+6+20=33