một hôp có 15 quả bóng bàn, trong đó có 9 bóng mới và 6 bóng cũ. Lần đầu chọn ra 2 bóng để sử dụng sau đó lấy thêm 2 bóng nữa để cho mượn
a) tính xác suất 2 bóng chọn lần sau là 2 bóng mới
b) giả sử biết rằng 2 bóng chọn lần sau là 2 bóng mới. tính xác suất 2 bóng chọn lần đầu là 2 bóng mới ?

Answers

Answer 1

Answer:

Sorry but I cannot understand that language
Answer 2
SJDJJFFJRNDOOEBWGEEURJNFJFIFITITNTKFOTJ I DONT UNDERSTAND YOUT LANGUAGE

Related Questions

How many centimeters are equal to 9 meters? Enter your answer in the box.

Answers

Answer:

900 centimetres

Step-by-step explanation:

9x100=900

900 cm AAAAAAAAAAAAAAAAAAA

Find the amount to administer

Ordered: Vistaril 0.4 g PO BID

On Hand: Vistaril 25 mg/5 mL

Answers

Answer:

3mg per BID vistrail

Step-by-step explanation:

What is the perimeter of parallelogram WXYZ?
In the diagram, WZ=root26

Answers

Answer:

Step-by-step explanation:

incomplete question.

Find the unknown side length, x. Write your answer in simplest radical form.
A. 15
B. 5 square root of 10
C. 2 square root of 70
D. 4 square root of 37

Answers

Answer:

C .2 square root of 70 skaskaskaska

Solve using the quadratic formula

Answers

Answer:

-5, -1/2

Step-by-step explanation:

I could only show half of the steps, but you can use the app photo math, you just take a pic of the problem and it gives you the answer and explains the steps.

Trong không gian với hệ tọa độ Oxyz cho điểm A( 1;2;1)  , mặt phẳng ( ) : 4 0  x y z     và
mặt cầu ( ) : 1 1 4 36 S x y z             2 2 2 . Gọi (P) là mặt phẳng đi qua A , vuông góc với ( )  và
đồng thời (P) cắt mặt cầu (S) theo giao tuyến là một đường tròn có bán kính nhỏ nhất. Biết rằng phương
trình của mặt phẳng (P) khi đó là ax by cz a b c      1 0 ( , , ) . Tính giá trị biểu thức T a b c    2 .
A. T  5
.
B. T  3
.
C. T 10
.
D. T 1
.

Answers

Answer:

lỗi text rồi. ko đọc dc :))

There are 13 books on a shelf. 8 of these books are new. The rest of them are used. What is the ratio? (PICTURE)​

Answers

Answer:

(a) 5:13

(b) 5:8

Step-by-step explanation:

There are 13 books in all.

8 books are new.

13 - 8 = 5 books are used.

Ratio of used books to all books: 5 used books : 13 books in total.

Ratio of used books to new books: 5 used books : 8 new books.

~

Answer

A=  [tex]\frac{5}{13}[/tex]  Or 5:13

B= [tex]\frac{5}{8}[/tex] or 5:8

Step-by-step explanation:

the question asked for you to show the ratio for the number of used books compared to the total number on the shelf. Since it tells us that 8 of the 13 books are new that would mean that the other 5 books that are on the shelf with the 8 new ones would be used. Then you just put it in a ratio, which if im remembering correctly from when i learned this it just looks like a fraction basically. Same goes for the second question except you are just putting the number of used books to the number of new books in ratio form. Hope this helps and also if you  need help learning ratios i gotchu covered :)

SOMEBODY HELP ME ASAP​

Answers

Answer:

B.   3x = 90

Step-by-step explanation:

m<QPS + m<RPS = m<QPR

Let m<RPS = x

Then m<QPS = 2x

2x + x = 90

3x = 90

Answer: B.   3x = 90

a) How does the distance traveled and time elapsed compare for Carrie and Kevin as they traveled from mile marker 225 to mile marker 230?

Answers

Answer:

They travelled the same distance and they spent the same amount of time from the 225 marker to 230 marker.

Step-by-step explanation:

Given

See attachment for graph

Required

The relationship between distance and time travelled by Kevin and Carrie

The straight line represents Kevin's journey while the curve represents Carrie's

From the graph, we can see that the straight line and the curve both start at the origin (0,0) and they both end at the same point (17,5)

Point (17, 5) represents the 230 marker (i.e. 225 + 5 - 230)

Since the line and the curve meet at this point, then they travelled the same distance and they spent the same amount of time.

(-64c)(-1) if c = -1.

Answers

Answer:

-64

Step-by-step explanation:

Nếu đồ thị của y=f(x) đi qua điểm (0,1), và dy/dx=xsin(x^2)/y, thì f(x)= ?

Answers

См. картинку во вложении, ответ отмечен красным цветом.

A Chippendale style curio with a selling price of $229 was advertised at $129. The cost price
is $78, and overhead is estimated at 45% of the cost price. Determine whether a sale results in a profit or a loss

Answers

Answer:

the results of the sale is profit

Can someone please help me with this question they are 2 different questions, separate them please I need them right now ):

Answers

Answer:
7.- BC = 22
8.- EF= 8

Explanation

I don’t really now how to explain this in English but I’ll try.
Since both triangles are congruent, you just have to take the similar segments. For question 7, BC and EF are similar, so you write it down as a division, then you have to equally to the adjacent segments, in this case will be AB/ DE

BC/EF = AB/DE

Then you only have to multiply them in cross, so it would be

BC*DE = EF*AB

U will have function and now u have to find x (cabin this case represents the length of the BC segment)

x*5 = 10*11

Now u clear the x, and it gonna look like

x= 10*11/5

U solve that and the answer is 22

I’ll attach some images in case u don’t understand

Answer:

7. [tex]BC=22[/tex]

8. [tex]EF=8[/tex]

Step-by-step explanation:

7.

It is given that triangle (ABC) is similar to triangle (DEF). This means that triangle (DEF) is a scaled version of the triangle (ABC). Between these two triangles, there is a ratio. This ratio referred to as the ratio of similitude, is a factor that one multiplies a side of the triangle by, to get the length of the corresponding side in the other triangle. This number can be found by dividing the corresponding sides in the triangle.

As per the given picture, side (AB) corresponds to side (DE). Therefore divide side (AB) by (DE) to find the ratio of similitude,

[tex]\frac{AB}{DE}=\frac{10}{5}=2[/tex]

Multiply side (EF) by the ratio of similitude to find the length of its corresponding side (BC).

[tex]2(EF) = 2(11) = 22[/tex]

[tex]BC=22[/tex]

8.

The triangles (ABC) and (DEF) are similar. One can use the same logic applied to the last problem to solve this problem. For further reference, read the intro written to explain the process used to solve the problem (7).

One can see that sides (AB) and (DE) are corresponding sides, divide (DE) by (AB) to find the ratio of similitude;

[tex]\frac{DE}{AB}=\frac{4}{6}=\frac{2}{3}[/tex]

Now multiply this number by side (BC) to find the length of the corresponding side (EF);

[tex](BC)*\frac{2}{3}=EF\\12*\frac{2}{3}=EF\\8=EF[/tex]

A tank contains 1000L1000L of brine with 20kg20kg of dissolved salt. Pure water enters the tank at a rate of 15L/min.15L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. Answer the following questions. 1. How much salt is in the tank after tt minutes

Answers

Answer:

there is 15[tex]e^{ \frac{-t}{100}[/tex] amount of salt in the tank after t minute.

Step-by-step explanation:

Given the data in the question;

tank contains 1000L of brine with 20kg of dissolved salt, Pure water enters the tank at a rate of 15L/min.

How much salt is in the tank after t minutes.

Now,

let x represent the amount of salt after t minutes,

so

x(0) = 15

dx/dt = rate in - rate out

Now, since the water entering is pure, the rate in is 0

rate out will be; x/1000 × 10 kg

dx/dt = -x/100

[tex]\frac{1}{x}[/tex]dx = -[tex]\frac{1}{100}[/tex]dt

∫[tex]\frac{1}{x}[/tex]dx =  -[tex]\frac{1}{100}[/tex]∫1dt + c

lnx =  -[tex]\frac{t}{100}[/tex] + c

Now since x(0) = 15

ln15 = c

lnx =  -[tex]\frac{t}{100}[/tex] + ln15

x = [tex]e^{ \frac{-t}{100} + ln15[/tex]

x = 15[tex]e^{ \frac{-t}{100}[/tex]

Therefore, there is 15[tex]e^{ \frac{-t}{100}[/tex] amount of salt in the tank after t minute.

The number of employees for a certain company has been decreasing each year by 7​%. If the company currently has 510 employees and this rate​ continues, find the number of employees in 11 years.

Answers

Answer:

230

Step-by-step explanation:

a = 510(0.93)^t

a = 510(0.93)^11

a = 229.5528082951

Rounded

a ≈ 230

If two pencils cost $1.50 how many pencils can you buy with $9.00?​

Answers

Answer:

12 PENCILS

Step-by-step explanation:

1.50 / 2 = .75

9.00/0.75 = 12

you can buy 6 pencils



A type of cat food contains chicken bones and chicken pieces in the ratio 20:7. What
weight of chicken pieces is needed to make 2 kg of cat food?

Answers

Answer:

0.5185 kg are needed to make 2 kg of cat food

Step-by-step explanation:

Chicken bones and chicken pieces in the ratio 20:7

This means that [tex]\frac{20}{20 + 7} = \frac{20}{27}[/tex] of the total weight is of bones and [tex]\frac{7}{27}[/tex] is of pieces.

What weight of chicken pieces is needed to make 2 kg of cat food?

7/27 of 2kg. So

(7/27)*2 = 14/27 = 0.5185 kg

0.5185 kg are needed to make 2 kg of cat food

Solve for x in the diagram below

Answers

Answer:

26.67

Step-by-step explanation:

Cora's dad has asked Cora and her little brothers to rake the leaves in their yard. They rake all afternoon and fill a number of bags with leaves. Then, when Cora isn't looking, her brothers empty 6 of the bags to make a giant leaf pile! Cora is frustrated that only 5 bags of leaves remain. What equation can you use to find the total number of bags b that Cora and her brothers fill with leaves?

Answers

Answer:

11

Step-by-step explanation:

because they empty 6 bags and there are 5 bags left to that is 11 all together

The total number of bags of leaves b is given by the equation b = 11 bags

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the equation be represented as A

Now , the value of A is

Let the total number of bags be = b

The number of bags emptied by Cora's brother = 6 bags

The number of bags left with Cora = 5 bags

So , the equation will be

The total number of bags b = number of bags emptied by Cora's brother + number of bags left with Cora

Substituting the values in the equation , we get

The total number of bags b = 6 + 5

The total number of bags b = 11 bags

Therefore , the value of A is 11 bags

Hence , the number of bags of leaves is 11 bags

To learn more about equations click :

https://brainly.com/question/19297665

#SPJ2

18. One way to show that a statement is NOT a good definition is to find a _____

Answers

Answer:

Counterexample

Step-by-step explanation:

Counterexample ensures that you are stating your point or opinion and you firmly oppose their general opinion.

joe has read ​30 % of a book. He has 63 more pages to finish. How many pages are there in the​ book?

Answers

Answer:

90 pages

Step-by-step explanation:

30% complete

70% to go = 63 pages

t = total number of pages

0.7t = 63

∴ t = ⁶³/₀.₇

⁶³/₀.₇ = 90

A committee must be formed with 3 teachers and 3 students. If there are 10 teachers
to choose from, and 15 students, how many different ways could the committee be
made?

Answers

Answer:

54,600 ways

Step-by-step explanation:

i hope you understand this

Find the volume for the cone

Answers

Answer:

1526.81 mi cubed

Step-by-step explanation:

hope this helped!

Answer:

V=1/3πr2h

=1/3*3*9*9*18

=1458mi3

(π=3)

What is 5x5 answer for a cookie

Answers

Answer:

25

Step-by-step explanation:

26 because 5 5 times is equivalent to 26

Besties pls help!!!!

8) In the diagram below, what is the m measure of R.

Answers

Let's see what we can fill in here.

<ACE = 130

180 - 50 = 130

Now that we have two sides and an included angle, we can use the Law of Cosines.

Law of Cosines: c^2 = a^2 + b^2 - 2ab(cos(C))

Let's plug in what we know and solve!

c^2 = 40^2 + 38^2 - 2(40)(38)(cos(130))

R = 70.69706

Hope this helps!! :)

Answer:

R =70.6970629

Step-by-step explanation:

We need to use the law of cosines since we have 2 sides and the included angle

The angle inside is 180 -50 = 130

c^2 = a^2 + b^2 − 2ab cos(C)  where c is the side opposite the unknown angle

R^2 = 40^2 + 38^2 - 2*40 *38 cos (130)

R^2 = 1600 -1444-3040cos 130

R^2 = 3044-3040cos130

R^2 =4998.074333

Taking the square root of each side

sqrt(R^2) = sqrt( 4998.074333)

R =70.6970629

7. If ∠EAC measures 120oand ∠HBI measures 84o, find the measure of ∠BCA.
A.m∠BCA = 60
B.m∠BCA = 84
C.m∠BCA = 36
D.m∠BCA = 54

Answers

Given:

m∠EAC = 120° and m∠HBI = 84°.

To find:

The measure of ∠BCA.

Solution:

If two lines intersect each other then the vertically opposite angles are equal.

[tex]\angle HBI \cong \angle ABC[/tex]             (Vertically opposite angles)

[tex]m\angle HBI = m\angle ABC[/tex]    

[tex]84^\circ = m\angle ABC[/tex]              ...(i)

If two angles forms a linear pair, then  their sum is 180 degrees.

[tex]m\angle BAC+m\angle EAC=180^\circ[/tex]                 (Linear pair)

[tex]m\angle BAC+120^\circ=180^\circ[/tex]

[tex]m\angle BAC=180^\circ-120^\circ[/tex]

[tex]m\angle BAC=60^\circ[/tex]              ...(ii)

According to the angle sum property, the sum of all interior angles of a triangle is 180 degrees.

[tex]m\angle ABC+m\angle BAC+m\angle BCA=180^\circ[/tex]                 (Angle sum property)

[tex]84^\circ+60^\circ+m\angle BCA=180^\circ[/tex]          [Using (i) and (ii)]

[tex]144^\circ+m\angle BCA=180^\circ[/tex]

[tex]m\angle BCA=180^\circ-144^\circ[/tex]

[tex]m\angle BCA=36^\circ[/tex]

Therefore, the correct option is C.

what is –6,486 ÷ –69 =

Answers

Answer:

94

Step-by-step explanation:

Answer:

The answer is 94.

Step-by-step explanation:

The answer is positive because a negative divided by a negative equals a positive.  

NEED ANSWERS ASAP



you have a recipe that indicated to use 7 parts of sugar for every 4 parts of milk. You use 28 cups of sugar. How many milk do you need?

Answers

Answer: 16

Step-by-step explanation:

I need one more brainliest for next rank I’d appreciate it

Answer:

16 cups milk is the answer

Question Progress
Homework Progress
54/118 Marks
A semicircle has radius 8.2 cm.
Work out the area of this semicircle.
Take a to be 3.142 and give your answer to 1 decimal place.

Answers

Answer:

Area = 105.6 square cm

Step-by-step explanation:

[tex]Area \ of \ circle = \pi r^2\\Area \ of \ semi-circle = \frac{1}{2} \pi r^2 = \frac{1}{2} \times 3.142 \times 8.2^2 = 105.6cm^2[/tex]

An underwriter is analyzing the heights of his clients. He categorizes 35% as tall, 40% as medium height, and 25% as short. He then randomly picks two clients (from his very large client base). What is the probability that neither is tall and at most one is medium height

Answers

Answer:

0.2625 = 26.25% probability that neither is tall and at most one is medium height.

Step-by-step explanation:

Desired outcomes:

Short - Short

Short - Medium

Medium - Short

Probability of two short:

25% are short, so:

[tex]P(A) = (0.25)^2 = 0.0625[/tex]

Probability of short medium or medium short

25% short, 40% medium. So

[tex]P(B) = 2*0.25*0.4 = 0.2[/tex]

What is the probability that neither is tall and at most one is medium height?

[tex]P = P(A) + P(B) = 0.0625 + 0.2 = 0.2625[/tex]

0.2625 = 26.25% probability that neither is tall and at most one is medium height.

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