Is this graphs function or not a function?

What number must you add to complete the square x^2+12x=16

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.

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.