Did you read all the explanations? It tells you what you need to do. Or is it a certain part you don’t get? Maybe I can help but I need to know what it is that your struggling with. Also you need a book.
One axis would be seconds 1,2,3,4,5 ect. and the other axis would be feet 15,30,45,60,75 ect.
Answer:
A:that my sister gave it to me
Explanation: