The answer is the letter C
We know, S = n/2 [a + l]
Substitute the known values,
-7980 = 84/2 [a + l ]
a + l = -7980/42
a+l = -190
In short, Your Answer would be: Option B
Hope this helps!
Answer:
hour 3 to hour 4
Step-by-step explanation:
that is where the slope is the least steep
2) 2 2/5
3) 8/5
4) 6 1/2
5) 12
6) 2 1/10