Posted by **Anonymous** on Monday, June 18, 2012 at 8:38pm.

Will you please check my work for me.

1)The equation of a parabola is shown.

y=1/14X^2. What are the coordinates of the focus?

(0,-3.5) <----

(0,-4)

(0,7)

2)The equation x2 + (y + 3)2 = 36 models the boundary on a local map for which Darren can hear his friend Tom on his two-way radio when Darren is at home. How far (in miles) can Tom walk from Darren's home and still be heard?

3 miles

6 miles<----

2 miles

12 miles

3)A plane intersects only one nappe of a double-napped cone. It is neither perpendicular to the cone's axis nor parallel to its generating line. Which conic section is formed?

point

circle

ellipse <-----

parabola

- Algebra2 ( Check) -
**Henry**, Tuesday, June 19, 2012 at 8:51pm
1. Y = (1/14)x^2.

V(h,k)

h = Xv = -b/2a = 0 / (1/7) = o.

k = Yv = (1/14)*0^2 = 0.

4a = 4(1/14) = 4/14 = 2/7.

1/4a = 7/2.

V(0,0), F(0,y).

VF = y-0 = 1/4a = 7/2

y-0 = 7/2

Y = 7/2 = 3.5.

F(0,3.5).

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