Posted by **Marissa** on Tuesday, August 21, 2007 at 5:09pm.

1)Write an equation for the parabola with focus (1,3)and vertex(0,3)

answer= x= 1/4(y-3)^2

2)Write an equation for a circle if the endpoints of a diameter are at (1,1)and(1,-9)

answer= (x-1)^2+(y+4)^2=25

3)Which is the equation of a circle with center (0,1)and radius 2 units?

answer= x^2+y^2-2y=4

1) correct for the vertex but I don't know about the focus

2) wrong ( I again plugged your equation into my calculator and I didn't get the diameter as what was given)

3) correct

what do you mean?

for number 2

A.(x-1)^2+(y+4)^2=5

C.(x+1)^2+(y-4)^2=5

D.(x+1)^2+(y-4)^2=25

is it A?

number 1

A.y=(x-4)^2-15

B.y=4(x-1)^2+5

C.y=4(x-1)^2-3

Checking again..2 is fine

I was looking on the wrong side of the circle for the diameter points.

## Answer this Question

## Related Questions

algebra - 1)What is the distance between the museum and sailing club.I cant post...

algebra - A few more question Id like for someone to check please. 1) what are ...

Algebra - Can someone tell me if I am right? I need to find the equation of a ...

algebra problem - I need to find the equation of a parabola. I am not sure if ...

algebra - 1)Write an equation for an ellipse if the endpoints of the major axis ...

Algebra II - Write an equation for the parabola with focus (1,3) and vertex (0,3...

pre cal - What is the center of the conic whose equation is x^2 + 2y^2 - 6x + ...

algebra - Write an equation for a parabola with vertex at (3, -6) and focus at...

algebra - Write the equation for a parabola with vertex ( -2, 3) and focus ( -2...

algebra 2 - Write the equation for a parabola with vertex (-2 , 3) and focus ( -...