Answer:
c, i and 3
Step-by-step explanation:
if you look at the congruence signs, then you will see that the 70 degree angle is in the same place.
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
Answer : Y=-15/7
Explanation:
