10+10+10=30 5+5+10=20 4+4+5=13 5+5×2=

15

Step-by-step explanation:

Sorry about the first time,

so if you follow the order of operations you would do multiplication first so 5*2=10 then following up with addition so add five to get 15.

And if we compare this to the general equation for a circle:

We see that the radius is and the center would be

Step-by-step explanation:

For this case we have the following equation:

We need to complete the square for x and y like this:

And simplifying we got:

And if we compare this to the general equation for a circle:

We see that the radius is and the center would be