What is the directrix of a parabola with focus (4,-1) and a vertex at (4,-5)?
1 answer:
Answer:
<h3> y = -9</h3>
Step-by-step explanation:
The directrix is at the same distance from the vertex as the focus but on the opposite side of the vertex.
x coordinate the same for a focus and a vertex (4) means the parabola opens up or down and the directrix is parallel to the x-axis.
y coordinate of the focus greater than y coordinate of the vertex means the parabola opens up and the directrix lays below the vertex.
-1-(-5) = - 1 + 5 = 4
so: - 5 - 4 = -9 is the y coordinate of points of the directrix
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Answer: 22
Step-by-step explanation:
I think it's 143 I hope it will help you
You can make an equation
6+x(1.5)=36
-6 -6
x(1.5)=30
/1.5 /1.5
----------------
x=20
You can buy 20 tickets or less so
x is less than or equal to 20
B
Answer:
27.52 percent
Step-by-step explanation:
Percentage increase = (new - original)/ original * 100
new = 318270
old = 249583
Substitute in what we know
percentage increase = (318270-249583)/249583 *100
= (68687/249583) *100
.275207045*100
27.5207045 percent
tan = opp/adj
x = 13(tan 45)
x = 13
//
a² + b² = c²
13² + 13² = 338²
square root of 338 is not a rational number so turn into mixed radical.
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