Answer:
the answer is 6
Step-by-step explanation:
Answer:
Sol1 you can use "first(first+last)/2" is 138(138+1)/2 - 38(38+1)/2 = 8850
Sol2 or you can look this 39+40+41+....+100+(100+1)+(100+2)+....+(100+38) = 1+2+3+.....+99+100+100(38) = 5050+3800 =8850
1. D
2. B
3. A
Hope this help :)
It is already rounded to the tens because there is no digit but 0 in the ones digit. I hope this helped.
