College Algebra Word Problem?
I have this word problem I've been stuck on all day. Its pretty long and has a picture so rather than trying to describe it I thought I'd take a pic. Any help I get is greatly appreciated, thank you.
http://i45.tinypic.com/24g4y1e.jpg
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For a parabola that is a function of y, with vertex at the origin and focus at (p, 0):
y^2 = 4*p*x
Focus = (0.8, 0) so p = 0.8 and y^2 = 4*0.8*x
y^2 = 3.2x
If the y-value of the "lip" of the reflector is +/-3
9 = 3.2x---> x = 9/3.2 = 45/16