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Anni [7]
3 years ago
11

Point R(−3, 9) belongs to the graph of the function y= k/x^2 . Find the value of k.

Mathematics
1 answer:
lorasvet [3.4K]3 years ago
4 0

Answer:

k = 81

Step-by-step explanation:

y = k / x²

Plug in values.

9 = k / (-3)²

9 = k / 9

Solve for k by multiplying both sides by 9.

k = 81

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allsm [11]

Answer:

Step-by-step explanation:

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2 years ago
A multiple-choice test consists of 10 questions. Each question has answer choices of a ,b c, d ,e , and , and only one of the ch
aalyn [17]
Its easier to find the complement of that instead
so you find the probability of 1 and 0
The .2 in the answer is the probability of each question 1/5
  (10 C 0) x .2^0 (1-.2)^10-0=.1074
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4 0
3 years ago
A tunnel is 300 feet deep and makes an angle of 30 with the ground .
Goshia [24]

Answer:

\boxed{C.\:\: 600\:feet}

Step-by-step explanation:


The tunnel, the ground and the depth of the tunnel form a right angle triangle.

The length of the tunnel is the hypotenuse of the right triangle that has been formed.


Let the length of the tunnel be m\: feet.


Using the sine ratio, we obtain;


\sin(30\degree)=\frac{Opposite}{Hypotenuse}


The length of the opposite side is 300\:feet


We substitute the given values to obtain;


\sin(30\degree)=\frac{300}{m}


\Rightarrow \frac{1}{2}=\frac{300}{m}


We cross multiply to obtain;


m=300\times2


m=600\:feet


Therefore the correct answer is C.


4 0
3 years ago
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The first and last choices are the only ones whose angles total 180 degrees, so they're the only possible triangles.
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