What is the focus of the parabola

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I've seen so many wrong answers and I got it wrong on my quiz

(-4,1)

(-4,1)

Step-by-step explanation:

The given parabola is

When we rewrite in vertex form, we get;

Or

When we compare to:

We have 4p=-4

This means p=-1

But the vertex is at:

(-4,2)

Since it is a vertical parabola that opens down, the focus is one unit(|p|=1) below the vertex.

Hence the focus is (-4,1)

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when the daily mileage is greater than 40 miles, unlimited mileage plan will save you money. 40 miles is the break-even point.

step-by-step explanation: