So I have number 1 for you.
She is wrong because 12 is not y2 (second sub) . It is actually supposed to be 4-12 / 7-9.
Answer:
circumference.
Step-by-step explanation:
Answer: 1/7
Step-by-step explanation: 12/22 • 11/21 • 10/20
20 because there are many more
Here you have the solution. If you are interested in the law which I have used here, you can read about countinuity of fluid principle.