Answer:
The answer is A 21
Step-by-step explanation:
Answer:
x=-4/3
Step-by-step explanation:
3x-12=12x
3x-12x=12
-9/-3=12/-3
then -3 cancels
3x/3=-4/3
then 3 cancels 3
so x=-4/3
The sketch of the parabola is attached below
We have the focus

The point

The directrix, c at

The steps to find the equation of the parabola are as follows
Step 1
Find the distance between the focus and the point P using Pythagoras. We have two coordinates;

and

.
We need the vertical and horizontal distances to find the hypotenuse (the diagram is shown in the second diagram).
The distance between the focus and point P is given by

Step 2
Find the distance between the point P to the directrix

. It is a vertical distance between y and c, expressed as

Step 3
The equation of parabola is then given as

=


⇒ substituting a, b and c


⇒Rearranging and making

the subject gives
Answer:
Step-by-step explanation:

1 toy costs $3 ( $3 x 1 = $3)<span>
2 toys cost $6 ( </span> $3 x 2 = $6)<span>
3 toys cost $9 </span>( $3 x 3 = $9)
4 toys cost $12 ( $3 x 4 = $12)
answer 4 toys will cost $12