What is an equation of a parabola with vertex at the origin and directrix y =2.8?

Work Shown:

Vertex = (0,0) = (h,k)

directrix is y = 2.8

vertical distance from y = 0 to y = 2.8 is 2.8 units

2.8 = 28/10 = 14/5

p = 14/5 is the focal distance

a = -1/(4*p) = -1/(4*14/5) = -1/(56/5) = -5/56

The value of 'a' is negative because the directrix is above the focus, which means the focal point is below the vertex.

y = a(x-h)^2 + k

y = (-5/56)(x-0)^2 + 0

y = (-5/56)x^2

the central idea is that:

individuals should refuse to cooperate with institutions they believe unjust.

thoreau felt  that governments were more often agents of corruption than justice, even democracies, and that just because the majority feels a certain way does not make it just or correct in absolute terms. he uses the fact that slavery exists in our democracy to support this idea.

he goes on to say that, as a result, people should live true to their own internal laws regarding right and wrong, as a product of reflection and a moral life, rather than following every law that society imposes. 

step-by-step explanation:

42.4

step-by-step explanation:

convert to decimal