Aparabola can be represented by the equation y2 = 12x.
which equation represents the directrix?
y = –3
y = 3
x = –3
x = 3

The given equation of parabola is :

As ,

Focus = (3,0)

Vertex = (0,0)

Distance from focus to Parabola = Distance of Directrix from parabola = 3

But Directrix will lie on negative X axis.i.e at (-3,0).

Equation of line parallel to y axis and passing through (-3,0) is :

: x = -3→ Option 3  

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

43

step-by-step explanation: