The correct option will be the last one:
<em><u>Explanation</u></em>
The general equation for sinusoidal function is:
, where
Amplitude,
frequency and
y-intercept
Here the maximum value is 15 and the minimum value is -3. So, the distance between maximum and minimum values is 18. That means, the Amplitude, 
Frequency
is given as 3 and y-intercept
is 6
So, the required function will be:

Answer:
2.5, 5, 7.5
Step-by-step explanation:
Count.
Answer:
Point R
Step-by-step explanation:
Go back 12 points
Answer:
2.947
2.946
2.948
2.949
2.945
Step-by-step explanation:
all decimal points are 5 or greater so you round up.