Answer:
The answer to number 9 is d
Step-by-step explanation:
The Amplitude is pi and the period also is the right number if you use teh mathematical formula. 2pi ÷ pi^2 is 2÷pi, so it basically has to be d, since a and b don't have the correct Amplitude and c doesn't have the correct period.
2/13 of an hour
Answer: before i can answer i need the image
Answer: D
I got (-7,0) for the focus & Origin: (0,0)