When you put this into standard form for a parabola, your equation (after much sweating and bleeding from the eyeballs) found by completing the square is:
, which has a vertex at (-2.4, 7.6). To find the distance that the directrix is from the vertex (which is also the same distance the focus is from the vertex) we use the fact that
(you can omit the negative in front of it cuz distance will always be positive), and
. Since this is an upside down parabola, the focus is under the vertex ("inside" the parabola) while the directrix is above it. The directrix is a horizontal line. Because it is a horizontal line, it is 5/32 above the y-coordinate (or k) or the vertex. So we add 5/32 to the y-coordinate of the vertex to get 7.6+5/32 and that gives us a directrix of y = 7.76 rounded.
Value 14 so it must be 55 or something
Answer:
N is the intersection of CM and RN
Step-by-step explanation:
Answer: exact form: 7/3
decimal form: p=2.333333333
mixed number form: p= 2 1/2
Step-by-step explanation:
In this type of questions, you just need to plug in the numbers you are given. But don't forget to put parentheses around negatives and use them wherever you want to clarify the equation.
Now let's take the exponents first:
Then do multiplications:
Then add plusses and minuses:
So the answer is -17.