Question

I have a few concerns.

See below for details.

Answer 1

A circle has its center at (-1, 2) and a radius of 3 units. What is the equation of the circle?

(x - 1)2 + (y + 2)2 = 3 <-- Okay, so I know it's not this one. That was my first go.

(x + 1)2 + (y - 2)2 = 3

(x + 1)2 + (y + 2)2 = 9

(x + 1)2 + (y - 2)2 = 9

So we have B, C, or D.

Answer 2

I am under the impression we are using (x - h)(h - k)

Is h not the horizontal axis? If so, wouldn't A be correct?

Answer 3

The equation of a circle with center (a,b) and radius r is
(x - a)^2 + (y - b)^2 = r^2
For you...a is -1...b is 2 ... and r is 3
Just plug those numbers in.

Answer 4

(x - a)^2 + (y - b)^2 = r^2
For you...a is -1...b is 2 ... and r is 3

Which gives me (x - (-1))^2 + (y - 2) = 3^2

And... (x + 1)^2 + (y - 2) = 9.

Right?

Answer 5

you have my vote

Answer 6

I have some more.

Answer 7

For example, this one. I need some clarification. By the way, before we go further, this is FLVS Module IV Practice Exam - I can retake it however many times I want. It does not, in no way, go toward my grade or statistics. The entire exam is a preparation exam to help me understand key concepts and once I know the material on here, I will move forward to my actual exam.

Answer 8

Compassionate, you seem on the ball to me at least. The math looks absolutely beautiful and flawless.

Answer 9

We would minus z from everything.... right?

Answer 10

I am not with you then, to me, it should be w +x =180

Answer 11

That's not even an option

Answer 12

oh, sorry, z +x =180, not w

Answer 13

I'm trying to understand these practice questions so I can be prepared for the actual exam coming around. :)

It might be z + x, because x is supplementary to z...

Answer 14

Okay, so I divided it by two, but I feel I should be also multiplying it by 1/3. I remember lesson 9.01 talking about this, but it's not very clear. Can I get some clarity?

Answer 15

For Two Tangents to a Circle the formula is