1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alex
3 years ago
10

What is the equation of the parabola with a directrix at y = 4 and focus (0, -4).

Mathematics
1 answer:
Svet_ta [14]3 years ago
3 0
Given that the directrix is at y = 4 and the focus is at (0, -4), then the vertex is at (h, k) = (0, 0).
p is the distance between the vertex and the focus and between the vertex and the directrix = 4 and since the focus is below the directrix, p is negative, i.e. p = -4
Equation of a parabola is given by (x - h)^2 = 4p(y - k)
Therefore, the required equation is (x - 0)^2 = 4(-4)(y - 0)
x^2 = -16y
y = -1/16 x^2
You might be interested in
What is the basic ratio for 25:40
Rashid [163]

The basic ratio of 25:40 would be 5:8.

Since 25:40 is equivalent to the fraction 25/40, you would simplify.


25 (divided by) 5 = 5 


40 (divided by) 5 = 8 


So, the answer is 5:8.

6 0
3 years ago
If Sue worked 28 hours this week and made $172 in tips, how much did her weekly pay
sergejj [24]
Do 178 times 28 which equals 4,984 then you do 4,984 decided by 7 which equals 712 because there are 7 days a week. So the answer is 712.
6 0
2 years ago
Read 2 more answers
PLEASE PLEASE HELP ME!!
Ivenika [448]

Answer:

A-

X=11

(the solution is down)

B-

x+x+1+x+2=36

3x+3=36

3x=36-3

3x=33

x=33/3

x=11

------------

X=11

X+1=12

X+2=13

11+12+13=36

8 0
3 years ago
PLEASE HELP ME THANK U *0*<br><br>Find the RATIO and the EXACT VALUE of the given Cos A.​
weqwewe [10]

Answer:

Step-by-step explanation:

take angle A as reference angle

using cos rule

cos A=adjacent/hypotenuse

cos A=12/13

cos A=0.92

A=cos 23

A=23 degree

for ratio,

cos A=12/13

6 0
3 years ago
Read 2 more answers
A desk is on sale for $217, which is 38% less than the regular price. What is the regular price? ​
Shkiper50 [21]

Answer:

72

Step-by-step explanation:

shii ion even no

7 0
2 years ago
Read 2 more answers
Other questions:
  • A can do a piece of work in 4 hours and B can do it in 6 hours. How much time would they take working together to finish the wor
    10·2 answers
  • 18+(-12)+5 add integers
    11·2 answers
  • --- Find each missing length to the nearest tenth. ----
    14·1 answer
  • 2. which number is between 3 and 4 on a
    12·2 answers
  • In the formula a2+b2=c2, what is the value of a2?
    9·1 answer
  • Idk a? or no? like im really bad
    15·1 answer
  • A circle is centered at the point (5, -4) and passes through the point (-3, 2).
    13·1 answer
  • Which equation can be used to determine the distance between the origin and (–2, –4)?
    11·2 answers
  • Ayoo someone help its kinda ✨confusing✨
    14·2 answers
  • Maitenant on considère un carré ABCD dont l'aire est 6,25 dm au carré quelle est la mesure de son côté AB justifier.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!