Make a circle and then another circle. There should be a oval in the middle.
Like this:
https://docs.google.com/drawings/d/10jIdkQW5rnxfDS9T2WeqkwRTvl92oJsYkXVLj8Zn6hU/edit
I'll do the math for this, it may take me a few minutes so i will update this comment with an answer in just a minute. I always get anxious when nobody replies kind of quickly as i feel it is being forgotten. So just a heads up i'm working on a answer!
The minimum of a quadratic function, with a positive coefficient a, is its vertex.
Let's find the x₀ coordinate.
Now we need to find y₀ coordinate. That will be the minimum of function.
So, the minimum cost to produce the product is $13
Decompose 5x^2 − 70x + 258 into multipliers
Answer: 5(x − 7)^2 + 13; The minimum cost to produce the product is $13.