Hello :
the common ratio is r = -95-(-100)=5
the general terme is : un= u1+(n-1)r
un = -100 +(n-1)(5)
un =-100 +5n-5
un = 5n-105
The last term is : 100
un =100
5n-105 = 100
5n =205
n = 41 (Number of terms)
The last term is : u 41
<span>the sum is : S= (41/2)(-100+100)=0</span>
(2,0) and (-1/2,0) is the correct answer
It will be greater than the length of the third side always
1: 40 2: 78 3: 48 4: 26 5: 15 6: 70
Should be D. Let me know if you need more of an explanation.
