Answer:13-x= y
Step-by-step explanation:
I'm guessing the series is

Use the ratio test: we have

The series converges for

which has a radius of convergence of 1.
It would be C.88-x and there are 36 black keys on an 88 key piano
Step-by-step explanation:
Add all of the numbers together
7 + 9 + 0 + (-9) + (-7)
simplify it down to:
(7+9+0)= 16
-9 + (-7)= - 16
So, -16 + 16 = 0
then divide 0 by 5 to get the answer of 0
To find the mean you have to add all of the numbers together and then divide by the amount of numbers that you have.