3 years ago

Find the length of XY with endpoints X(-2,7) and Y(-2,-8

1 answer:

7 0

$length=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}=\sqrt{(-2-(-2))^2+(-8-7)^2}\\=\sqrt{0^2+(-15)^2}=\sqrt{225}=15$

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natta225 [31]

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kompoz [17]

average =65%

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We have the cards numbered as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.

Sample number is, n(S)=11.

We pick a card and want to get even number like 2, 4, 6, 8, 10, and 12.

Probability of picking an even number would be :-

P(even numbers) = $\frac{6}{11}$

Now we replace the card and want to get a 7 in second attempt.

Probability of picking a 7 would be :-

P(number 7) = $\frac{1}{11}$

Now Probability of this event = P(even numbers) × P(number 7)

Probability = $(\frac{6}{11} )(\frac{1}{11} ) = \frac{6}{121}$

So final answer is $\frac{6}{121}$ .

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