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.
All you have to do is figure out the bases of the figure and use the 12 and 13 in your problems and you should be able to get the right answer.
Answer:
we need the options
Step-by-step explanation:
what are the numbers
