The answer is 81 I think, I would suggest you to type in the calculator 4 • 18+9
a. Recall that
For , we have
By integrating both sides, we get
If , then
so that
We can shift the index to simplify the sum slightly.
b. The power series for can be obtained simply by multiplying both sides of the series above by .
c. We have
Answer:

Step-by-step explanation:
we know that
A linear pair is two angles that are adjacent and form a line. The angle measure of a line is 180 degrees
In this problem we have that
--- by supplementary angles (form a linear pair)
solve for x




The answer you are looking for is 45