If the coefficient a in the general quadratic equation is equal to 9, what is the focal length for the

parabola, d, equal to?

9

Step-by-step explanation:

Let the equation of a parabola be

= 4ax.

Then , focal length of the parabola is a.

As , (0,0) is the vertex and its focus is (a,0)

Thus, focal length comes out to be a.

Here,

a is given as 9 units .

Thus focal length of the parabola, d, equals to 9 units

47.28 or 47.2857143

step-by-step explanation:

you just divide 331 by 7 and you get that answer. ( i think so tho)