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The link doesn't work

it works on mine

umm i think lemme try

Okay if you need help, reply back with your computer OS(Operating System, Mac or Windows)

Here's the whole thing as pasted from the lesson

a radius is always positive

okay...?

that rules out 2 of your choices

so it's either B or C, but I still don't know which

the (x,y) pair at the center will make the (x-a)^2 and (y-b)^2 terms zero
does that make sense?

not really, no...

usually they say
(x-h)^2 + (y-k)^2 = r^2
and the center is at (h,k) with radius r

how do we get h and k?

so if you see (x- 1/2) that means the x value of the center is +1/2

okay

or remember that you want the y value that makes (y+1)^2 zero. that would be y= -1

so the Y is -1?

then it's C? Right?

yes.

Thank you soooooo much! I'm going to go write you a testimonial! haha

thank you