I’m not so sure but I think it’s a carrot
First let's start with the relationship between grams and centigrams and grams and milligrams.
1 gram = 100 centigrams
1 gram = 1000 milligrams
Because these two equations are equal, we can rewrite our equation as 100 centigrams = 1000 milligrams.
Now we divide by 100 to simplify our equation to 1 centigram = 10 milligrams.
With this simplified equation we see that we multiply the number of centigrams by 10 to find the equal number of milligrams.
When ANY number is multiplied by its own reciprocal, the product is ' 1 '.
ANSWER
Vertex form;

Vertex

EXPLANATION
Given:

We complete the square as follows:


The vertex form is:

The vertex is

One quarter. Because four quarters makes a whole.