Which of the following equations are equations of circles? choose all that apply.

Step-by-step explanation:

we know that

The equation of a circle ion standard form is equal to

where

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

Verify each case

case 1) we have

The radius squared cannot be a negative number

therefore

This equation is not the equation of a circle

case 2) we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Factor the leading coefficient of each expression

Complete the square twice. Remember to balance the equation by adding the same constants to each side.

Rewrite as perfect squares

This equation is not the equation of a circle

case 3) we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Complete the square twice. Remember to balance the equation by adding the same constants to each side.

Rewrite as perfect squares

This equation represent  the equation of a circle

case 4) we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Factor the leading coefficient of each expression

Complete the square twice. Remember to balance the equation by adding the same constants to each side.

Rewrite as perfect squares

Divide by 3 both sides

This equation represent  the equation of a circle

case 5) we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Complete the square twice. Remember to balance the equation by adding the same constants to each side.

Rewrite as perfect squares

This equation is not the equation of a circle

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

hope to and hope that my answer is brainliest.(follow me )

the reporter's right

step-by-step explanation:

1/4 = .25 / 25%