If the number before the place you are rounding to is a 5 or more you round up but if it is a 4 or below it stays the same so the answer is 28,000,000

nothing to it, t = year, and you can just plug that in your calculator.
Answer:
Substitute 0 for y
and solve to find the x-intercept.
x-intercept(s): (6,0)
It fails the vertical line test since the vertical line passes through both (2,3) and (2, -2). So the first option is correct in the drop down and the graph would not be a function.