Slope formula: y=mx +b
3y-4x=-6
+4x = +4x
__________
3y= 4x-6
3y/3= (4x-6)/3
Y= 4/3x -2
You set it up like:
5.4days x (24 hours/1 day) x (60 minutes/1 hour)
you get 7776 minutes
The vertex of the parabola is between the shortest line connecting its focus and directrix, so between (0, -4) and y = 4 is the point (0, 0), which is the vertex of the parabola. Also, this parabola faces downward.
The general formula for a parabola that faces downward is y = -4cx^2, where c is the distance from the vertex to either to focus or the parabola. Since c = 4, the equation is y = -16x^2, which is choice A.
Writing this statement symbolically, we get:
n
--- - 5 = 8
2
Adding 5 to both sides, we get n/2 = 13. Then n = 26.
