Suppose the radius of a circle is three units what is the circumference

or units

Step-by-step explanation:

The circumference of a circle can be found using the formula , where is the circle's circumference and is the circle's radius. We know that and that we are solving for . Therefore:

Since is approximately , units. Hope this helps!

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.