A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Which of the following circles have their centers in the second quadrant? Check all that apply.
A. (x + 2)2 + (y  5)2 = 9
B. (x  4)2 + (y + 3)2 = 32
C. (x  5)2 + (y  6)2 = 25
D. (x + 1)2 + (y  7)2 = 16
anonymous
 one year ago
Which of the following circles have their centers in the second quadrant? Check all that apply. A. (x + 2)2 + (y  5)2 = 9 B. (x  4)2 + (y + 3)2 = 32 C. (x  5)2 + (y  6)2 = 25 D. (x + 1)2 + (y  7)2 = 16

This Question is Open

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1first, can you tell me what the centre is for each of them?

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1To find the centre, use : centre of circle is at (h,k) equation:(x−h)2+(y−k)2=r2 So for e.g... for the first one A. \[(x+2)^2 + (y  5)^2 = 9 \rightarrow centre (2, 5) \]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0wait why did the 2 turn negative

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1because our general equation is this: \[(xh)^2 + (y k)^2 = r^2 , centre (h, k)\]

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1So when we compare it to: \[(x+2)^2 + (y  5)^2 = 9, centre (2, 5) \]

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1OKaaayyy let's seee :) A. centre (2, 5) B. centre (4, 3) C. centre (5, 6) D. centre (1, 7)

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1excellent work :)!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0d and a are the answers

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0they lie in the second quadrant

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1no problem :) That's correct :D Wonderful!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you for your help!

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1you're welcome ^_^!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The circle below is centered at the point (2, 1), and has a radius of length 3. What is its equation? http://media.apexlearning.com/Images/200707/01/7f8d2e189709467b9bc71dc4df8eb1a9.gif A. (x + 2)2 + (y  1)2 = 9 B. (x  2)2 + (y + 1)2 = 3 C. (x + 1)2 + (y  2)2 = 9 D. (x  1)2 + (y + 2)2 = 3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0when it asks for whats its equation, does it mean to fully work out the equation or just set it up?

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1Remember that the STANDARD equation of a circle is: \[(xh)^2 + (yk)^2 = r^2 \] where centre is at (h, k) So since they've told us that centre is at (2, 1) , you want to find the equation. They've also told you that radius (r) =3 So now we know h = 2, k = 1 , r = 3 so sub this into the standard equation of a circle :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it would be (x+2)^2(x1)^2=3^2

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1yess :D That's correct

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1you're welcome :D!
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.