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Given:

The equation of a circle is:

To find:

Center and the circumference of the circle.

Solution:

The standard form of a circle is:

        ...(i)

Where, (h,k) is center and r is the radius.

We have,

          ...(ii)

On comparing (i) and (ii), we get

So, the center of the circle is (3,0) and the radius of the circle is .

Now, the circumference of the circle is:

Therefore, the circumference of the circle is about 35.5 units.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)