Answer:
I Believe you are correct
Step-by-step explanation:
Ask every fifth person that exits the school
(systematic random)
The question is "What's Stella's opportunity cost of working on her serve for an hour?" The rest of the info looks like it's meant to confuse you. They charge $10 an hour. She values an hour of her time at $20. I believe that means she would pay $20. Hope this helps!