Yes, your answer are correct! There is a little work to be shown on number 1, but it isn't necessary.
Hope this helps! Brainliest it if it does!
Willa is not correct because If you multuply 2/3 by 2 you will get 4/6 which is same as willa's
Answer:
B
y = 3 cos (pi/12x - pi/4) + 17
Step-by-step explanation:
First find the average temperature which is 20 + 14/2 = 17
Find the amplitude
20 - 17 = 3
This means that that at noon, the shift is 3hrs past
the best equation that represents this scenario is 
Answer:
B
Step-by-step explanation:
So we have the formula:

And we want to solve it for r.
So, let's first divide both sides by π and h. This will cancel out the right side:

Now, take the square root of both sides:

And we're done!
Our answer is B.
I hope this helps!