Please help me im conffused

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.

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.