The value of k is 60
131 - 11 = 120
120/2 = 60
hope this helped !
I'm pretty sure it's 7 and 1/7
The first term of this series (a+1) is 1 and the common ratio (r) is -3.
Thus, the explicit formula is a_n = 1*(-3)^(n-1).
Must check this! suppose we try to calculate the 3rd term. Then n = 3.
a_3 = 1*(-3)^(3-1) = (-3)^2 = 9. This is correct.
Answer:
they are parallel to each other