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andrey2020 [161]
3 years ago
9

The focus of a parabola is (−5,−1) and the directrix is y=−3.

Mathematics
1 answer:
Bingel [31]3 years ago
8 0
(x+5)^2=4(y+2)

the equation for a parabola with focus (h, k+p) and directrix y=k-p is 
(x-h)^2=4p(y-k)

so using your directrix y=-3, and knowing directrix is y=k-p, you have 
-3=k-p.
similarly, knowing the focus is defined by (h,k+p) and your focus is (-5,-1)
you have the equation -1=k+p.

you now have a system of equations
-3=k-p \\ -1=k+p
which you can solve using any method, I will use elimination.
adding down
-4=2k \\ -2=k
you now have k and can find p using either equation. 
-3=k-p \\ -3=-2-p \\ -1=-p \\ 1=p.

now you plug those in, getting the answer
(x+5)^2=4(y+2)
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Answer:

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Step-by-step explanation:

1. yes, they work together to set the scene by providing details to where she is and why. the sentences describe her emotions without making the paragraph boring.

2. for the most part, the reasoning for her being there afterschool could have been mentioned first but the way it is currently written makes sense regardless.

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5 0
3 years ago
Help me please it’s due by today
anyanavicka [17]

Answer:

D

Step-by-step explanation:

Lateral SA = area of the 4 triangles

Formula to be used :-

Area (triangle) = 1/2bh

=> 4 x 1/2 x 9 x 12

=> 108 x 2

=> 216 cm²

Total SA = LSA + area of the square

Formula to be used :-

Area (square) = side length x side length

=> 216 + 9 x 9

=> 216 + 81

=> 297 cm²

<u>The correct option is (D).</u>

4 0
2 years ago
6,500 acres of a 41,000 acre forest burned in a fire. what percentage of forest was damaged?​
Tems11 [23]

Answer:

15.85%

Step-by-step explanation:

Given:

Acres damaged (burned) = 6,500 acres

Acres in total forest = 41,000 acres

Hence the amount of damaged forest as a fraction of the total forest,

= \frac{6500}{41000} = \frac{13}{82}

expressed as percentage = \frac{13}{82} x 100% = 15.85%

8 0
3 years ago
Whats 937X928(82|23) like what is this-
Zepler [3.9K]

Answer:

(71 301 952, 19 999 328)

Step-by-step explanation:

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6 0
3 years ago
The value of the expression -2 xy for x = -4.7 and y = 0.2 is _____.
sergeinik [125]

The value of the expression -2xy for x = -4.7 and y = 0.2 is 1.88. Thus option number 3 is correct.

<u>Solution:</u>

We have been given an expression that is -2xy and have been asked to find its value for the given values of x and y

The given values of x and y are -4.7 and 0.2 respectively.

To find the value of the expression for the given values of x and y we substitute the values of x and y in the given expression and solve it as follows:

Given expression = -2xy

\begin{array}{l}{=-2(-4.7)(0.2)} \\\\ {=9.4 \times 0.2} \\\\ {=1.88}\end{array}

Hence the option number 3 is correct.

4 0
3 years ago
Read 2 more answers
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