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Ivan
3 years ago
13

What is the rectangular equivalence to the parametric equations?

Mathematics
1 answer:
Usimov [2.4K]3 years ago
6 0

Answer:

\left(\frac{x-2}{3} \right)^{2}+\left(\frac{y+1}{2} \right)^{2} = 1 (An ellipse)

Step-by-step explanation:

Let consider the following trigonometric identity:

\sin^{2}\theta + \cos^{2}\theta = 1

Each trigonometric function is cleared respectively in given parametric equations:

\cos \theta = \frac{x-2}{3} and \sin \theta = \frac{y + 1}{2}

The equivalent expression in rectangular form is:

\left(\frac{x-2}{3} \right)^{2}+\left(\frac{y+1}{2} \right)^{2} = 1

Which represents an ellipse.

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In a state where license plates contain six digits, what is the probability that the license number of a randomly selected car h
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Answer:

Step-by-step explanation:

Given : In a state where license plates contain six digits.

Probability of that a number is 9 = \dfrac{1}{10}   [Since total digits = 10]

We assume that each digit of the license number is randomly selected  .

Since each digit in the license plate is independent from the other  and there is only two possible outcomes for given case (either 9 or not), so we can use Binomial.

Binomial probability formula:  P(X=x)=^nC_xp^x(1-p)^{n-x}

, where n= total trials , p = probability for each success.

Let x be the number of 9s in the license plate number.

X\sim Bin(n=6, p=\dfrac{1}{10}})

Then, the probability that the license number of a randomly selected car has exactly two 9's will be :

P(X=2)=^6C_2(\dfrac{1}{10})^2(1-\dfrac{1}{10})^{6-2}\\\\=\dfrac{6!}{2!(6-2)!}(\dfrac{1}{100})(\dfrac{9}{10})^4=0.098415

Hence, the required probability = 0.098415

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