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3 years ago

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In a class of 30 students, 13 have a brother and 8 have a sister. There are 3 students who have a brother and a sister. What is

the probability that a student who has a sister also has a brother?
Answer 3/8

1 answer:

Makovka662 [10]3 years ago

5 0

Answer:

$P(sister) = \frac{8}{30} \\$

Step-by-step explanation:

$P(sister) = \frac{8}{30} \\ P(brother) = \frac{13}{30} \\ P(SnB) = \frac{3}{30} \\$

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Can somebody please help me with this

Paul [167]

<em>∠PYG = 137°</em>

Step-by-step explanation:

We know that a straight line is equal to 180°, so by looking at the image we can tell that if we added both of these angles together they would be equal to the straight line.

We can make an equation by adding these two angles together and setting them equal to 180.

$2p+153+6p+91=180$

We can combine like terms.

$8p+244=180$

Subtract 244 from both sides.

$8p=-64$

Divide.

<em><u>p = -8</u></em>

Now that we have found what p is equal to, we can plug it in to find the measure of ∠PYG.

$2*-8+153$

<em><u>= 137</u></em>

~

If you wanted to double check this answer, we can plug in -8 for p on the other side and make sure both would be equal to 180.

Like this...

$6*-8+91$

= 43

And we know that...

137 + 43 = 180

~

So...

<u><em>∠PYG = 137°</em></u>

<u><em>∠HYG = 43°</em></u>

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OlgaM077 [116]

Answer:

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Step-by-step explanation:

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