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algol13
2 years ago
10

Có 30 đềthi trong đó có 10 đềkhó, 20 đềtrung bình. Tìm xác suất để:a)Một Học sinh bắt một đềgặp được đềtrung bình.b)Một Học sinh

bắt hai đề, được ít nhất một đềtrung bình
Mathematics
1 answer:
sergeinik [125]2 years ago
7 0

Answer:

ehfsxuefoenircuducrusxnrim

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What is the measure (in radians) of central angle theta in the circle below? enter an exact expression.
Llana [10]

Answer:

Measure of central angle is 3.665 radians

Step-by-step explanation:

In this question, we are trying to get the value of the central angle.

As we can see, the radius of the circle is 12cm while the length of the major arc is 14 pi cm.

Mathematically the length of an arc is calculated as follows;

Length of arc = theta/360 * 2 * pi * r

Plugging the values we have from the question;

14 pi = theta/360 * 2 * pi * 12

divide both sides by 2pi

7 = theta/360 * 12

360 * 7 = 12 theta

theta = (360 * 7)/12

theta = 210

Since 1 degree = pi/180 radian

it means 210 degrees = 210 * pi/180 = 3.665 radians

6 0
3 years ago
Consider these three numbers expressed in scientific notation: 8.2 × 10-3, 5.2 × 10-6, and 4.1 × 10-6. Which number is the great
Vedmedyk [2.9K]
1) 8.2 times 7
2)5.2 times 4
3)4.1 times 4
1) 57.4
2)20.8
3)16.4
Greatest:57.4
Least:16.4
Answer:57.4-16.4=41
6 0
3 years ago
Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its corre
Ad libitum [116K]

Answer:

1/3 is the answer.

Step-by-step explanation:

Tanya prepared 4 different letters to be sent to 4 different addresses.

To solve this we can do the following:

The probability that the 1st letter is in the right envelope is = \frac{1}{4}

The probability that the 2nd letter is in the wrong envelope is = \frac{2}{3}

The probability that the 3rd letter is in the wrong envelope is = \frac{1}{2}

The probability that the 4th letter is in the wrong envelope is = 1

So, the answer becomes: \frac{1}{4}\times \frac{2}{3}\times \frac{1}{2}\times1 = \frac{1}{12}

As we need 4 correct letters in the envelope, we will multiply by 4:

\frac{1}{12}\times4=\frac{1}{3}

3 0
3 years ago
Time left: 0:48:24<br>Question 11 of 50<br>What are the roots of the quadratic equation<br>x2+3x+2?​
alexgriva [62]

Answer:

-1 & -2

Step-by-step explanation:

x²+3x+2

x²+2x+x+2

(x²+2x)+(x+2)

x(x+2)+1(x+2)

(x+1)(x+2)

6 0
3 years ago
Read 2 more answers
Please help?i really need help with this.
Dafna1 [17]

every similar line means that they have the same value

x=8

y=10

go look for a way to find the last side in the small rectangle that has x and y




4 0
3 years ago
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