For this case we have:
By trigonometric property we have:

Where:

Substituting:

Clearing x we have:

Thus, the equation is: 
Answer:

Answer
22
Step-by-step explanation:
82-2=80-60=20+2=22
Hello!
In a symmetrical distribution the mean is in the middle, that is where the median is. Then, in a symmetrical distribution the mean and the median are the same value.
The Correct Answer: 130
I Hope my answer has come to your Help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead! :)
(Ps. Mark As Brainliest IF Helped!)
-TheOneAboveAll :D