Question

1.-35 + (30+5)

2.-0.15+(-0.85)+12.5

3. 1/2+(-3/4)

4.10+21+32+43+54+(-54)+(-43)+(-32)+(-21)+(-10)

pls help ​

Answer 1

1.-35 + (30 + 5)=-35+35=0

2.-0.15 + (- 0.85) +12.5

=[-0.15 + (- 0.85) ]+12,5

=-1 +12,5=11,5

3. 1/2 + (- 3/4)= 2/4+(-3/4)=-1/4

4.10 + 21 + 32 + 43 + 54 + (- 54) + (- 43) + (- 32) + (- 21) + (- 10)

=[10+(-10)]+[21+(-21)]+[32+(-32)]+[43+(-43)]+[54+(-54)]

=0+0+0+0+0=0

Explanation: