First we will find the 11th term
an = a1 + (n-1) * d
a11 = 12 + (11 - 1) * 5
a11 = 12 + 10 * 5
a11 = 12 + 50
a11 = 62
now we use the sum formula...
Sn = (n (a1 + an)) / 2
S11 = (11 (12 + 62)) / 2
S11 = (11 (74)) / 2
S11 = 814/2
S11 = 407
100,000 (sorry if I'm wrong)
It would be 5%. I know the answer is right I just don’t know how to explain it. Sry. But I hope this helps.
ZERO
as it is eventually multiplied by 0
The distributive property of division over addition and substraction is idk
