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geniusboy [140]
3 years ago
11

If the directrix of a parabola is the horizontal line y = 3, what is true of the parabola?

Mathematics
2 answers:
12345 [234]3 years ago
3 0
The correct answer is b), or x² = -12y.

Explanation:
This equation may be written in standard form as
y=- \frac{1}{12} x^{2}
The coefficient in front of x² is negative so the curve is downward.
The vertex has coordinates (0,0).
The vertex is equidistant from the directrix and the focus, so the focus is (0, -3).

balu736 [363]3 years ago
3 0

Answer: on e2020 it’s b

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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For which value of theta is cot (theta) undefined?
sattari [20]

The cotangent function is defined as the ratio between cosine and sine of a given angle, i.e.


\cot(x) = \frac{\cos(x)}{\sin(x)}


Since you can't have zero at the denominator, the cotangent function is not defined when the sine is zero.


Let's look at your option:


\sin(90^\circ) = 1, so the cotangent is defined here


\sin(180^\circ) = 0, so the cotangent is not defined here


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6 0
3 years ago
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Name an event that would be measured in days
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8 0
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A ferry charges $30 per car plus $5 for each passenger in the car.
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Solve √(3x+7)+2√(x-8)=0.
laiz [17]

Answer:

The solution to this question is 39

Step-by-step explanation:

Given that :

√(3x+7)+2√(x-8)=0.    

√(3x+7)=-2√(x-8)           (i)

square of the equation (i)

Then

(√(3x+7))^2=(-2√(x-8))^2

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39=1x

x=39.

4 0
3 years ago
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