Step-by-step explanation:
You said the other one would be the last haha just kidding I'm glad to help.
16. 
First, get rid of that parenthesis.

Now multiply both sides by 2 so that you can isolate k


19. 
This is a pretty easy one. If you didn't know, 121/11 is actually 11 :)

Simply multiply by 3 to isolate r :)


Answer:
175 is the answer
Step-by-step explanation:



Answer:
32
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Answer:
Step-by-step explanation:
I cant remember how to do it but one way would be to find the series expansion of this at x = ∞.
Answer:
option 1 hope this helps :)
Step-by-step explanation: