How do you solve each system by graphing

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Does the point (1, sqrt 7) lie on circle shown.

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?