This sequence has generating function
(if we include 
for a moment)
Recall that for 
, we have
Take the derivative to get
Take the derivative again:
Take the derivative one more time:
so we have
Hmmm wait let me try to do it
Answer:
21
Step-by-step explanation:
13 + 4(9-7) =
13 + 4(2) =
13 + 8 = 21
It’s simple you just multiply all three numbers 20*3*4=240
Both of those equations are solved for y. So if the first one is equal to y and the second one is equal to y, then the transitive property says that the first one is equal to the second one. We set them equal to each other and solve for x. 4x-5=-3 and 4x = 2. That means that x = 1/2. We were already told that y = -3, so the coordinates for the solution to that system are (1/2, -3), B from above.
