What is the tax on $2.99 if the tax is 7 percent

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.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.