For the first 60 positive integers, a = 1, n = 60, l = 60.
Sn = n/2(a + l)
s = 60/2(1 + 60) = 30(61)
For the next 60 positive integer, a = 61, n = 60, l = 120
Sum = 60/2(61 + 120) = 30(61 + 120) = 30(61) + 30(120) = s + 3600
Sum of first 120 positive integers = s + s + 3600 = 2s + 3600
Answer:
c 81
Step-by-step explanation:
Answer:

Step-by-step explanation:
Apply triangle interior theorem,



Answer:
10.4kg or 10kg 400 g
Step-by-step explanation:
1kg-1000 grams
600grams-0.6 kg
800 grams=0.8kg
6.6 kg +3.8kg
=10.4kg
or convert it back to the question
so the answer will be 10kg 400g