Hai giá sách có 450 cuốn sách .Nếu chuyển 50 quyển từ giá thứ nhất sang giá thứ hai thì số sách ở giá số hai sẽ bằng 4/5 số sách ở giá thứ nhất ?Tính số sách ở mỗi giá.

Answer:

A graph shows lap time (seconds) labeled 82 to 98 on the horizontal axis and the number of laps on the vertical axis. 1 lap was 82 to 84 seconds.  4 laps were 84 to 86 seconds. 2 laps were 86 to 88 seconds. 4 laps were 88 to 90 seconds. 6 laps were 90 to 92 seconds. 5 laps were 92 to 94 seconds. 2 laps were 94 to 96 seconds. 0 laps were 96 to 98 seconds

Step-by-step explanation:

The given table is presented as follows;

[tex]\begin{array}{ccc}Day \ 1 \ lap \ times \ (seconds)&Day \ 2 \ lap \ times \ (seconds)&Day \ 3 \ lap \ times \ (seconds)\\83&87&85\\92&90&86\\91&92&91\\89&91&93\\94&92&91\\93&95&89\\88&90&88\\84&85&84\end{array}[/tex]The number of laps in the range 82 to 84 seconds = 1

The number of laps in the range 84 to 86 seconds = 4

The number of laps in the range 86 to 88 seconds = 2

The number of laps in the range 88 to 90 seconds = 4

The number of laps in the range 90 to 92 seconds = 6

The number of laps in the range 92 to 94 seconds = 5

The number of laps in the range 94 to 96 seconds = 2

The number of laps in the range 96 to 98 seconds = 0

Therefore, the histogram that represents Blanca's lap times for the three days of practice is described as follows;

A graph shows lap time (seconds) labeled 82 to 98 on the horizontal axis and the number of laps on the vertical axis. 1 lap was 82 to 84 seconds.  4 laps were 84 to 86 seconds. 2 laps were 86 to 88 seconds. 4 laps were 88 to 90 seconds. 6 laps were 90 to 92 seconds. 5 laps were 92 to 94 seconds. 2 laps were 94 to 96 seconds. 0 laps were 96 to 98 seconds

Answer: A.

Step-by-step explanation: On Edge!

We can expect to roll a prime number 48 times.

Theoretically, when you roll a number cube all the possible numbers have the same probability, 1/6.

We know that the numbers in a number cube are {1, 2, 3, 4, 5, 6}

Of these, the primes are: 2, 3, and 5.

So half of the outcomes of a number cube are primes.

This means that, in every single roll, the probability of getting a prime number is 1/2.   (1/6 + 1/6 + 1/6 = 3/6 = 1/2)

Then for 96 rolls, we should expect to see in half of these a prime number as an outcome.

This means that we should expect to roll a prime number 96/2 = 48 times.

If you want to learn more about probability, you can read:

https://brainly.com/question/24316600

You should expect to roll a prime number 64 times.

To determine, if you roll a number cube 96 times, how many times would you expect to roll a prime number, the following calculation must be performed, knowing that the prime numbers are those that can only be divided by 1 or by themselves:  

A cube has 6 sides. Therefore, the numbers in the cube will be 1, 2, 3, 4, 5 and 6. Of these numbers, only 4 and 6 are not prime, since 4 is divisible by 2 and 6 is divisible by 2 and 3.

Therefore, 4/6 numbers are prime, that is, 66.66% of the numbers in the cube.

Therefore, if you roll a number cube 96 times, since 96 x 4/6 equals 64, you should expect to roll a prime number 64 times.

Learn more in https://brainly.com/question/23715861.

Step-by-step explanation:

the scanned description is very hard to understand.

so I think what happened :

16x² - 9 = 16

then the first error :

sqrt(16x²) - sqrt(9) = sqrt(16)

that is wrong, as you cannot split a + or - operation inside a sqrt function into + or - separate sqrt results of the parts.

so, correctly, the only possible transformation involving sqrt for both sides :

sqrt(16x² - 9) = sqrt(16)

but it would be even easier to clean up the various constant numbers with each other.

so,

16x² - 9 = 16

16x² = 25

and now we trashes the square root

sqrt(16x²) = sqrt(25)

4x = 5

x = 5/4 or x = -5/4

and I cannot see or understand for my life what the second equation was, as Daniel did something wrong, so I cannot deduct the original equation out of a supposedly wrong

y³ - 1 = 7

Answer:

one fourth of 20 = 5

(4+7)-4*5

11-4*5

11-20

-9

5+a2+ab-9c

let's just substitute a with 5, b with 4 and c with 0

5+5*2+5*4-9*0

= 5+10+20+0

= 35

Answer:

hhghhhhhhhhh

Step-by-step explanation:

yyyyjuiynrjdjf

Answer:

Step-by-step explanation:

I am not sure if you are asking for the graph of

√(x-16) that has a x intercept at (16,0)

or

√ x -16 that has a y intercept at (0, -16)

Answer:

28° because this is an isosceles triangle, and isosceles triangles have congruent base angles.

Answer:

A or 28

Step-by-step explanation:

Cause if both of the sides is 6, than that means that its equal. So 28 on one side and 28 on the other.

Answer:  

x=5  

Step-by-step explanation:

x is the length of the line segment from the center to the boderline of circle. So x=5

Answer:

b -7/8 > -0.50

Step-by-step explanation:

is your answer

Answer:

- 7/8 > -0.50

Step-by-step explanation:

-7/8 =-.875

Change to get decimals with decimals or fractions to have a common denominator

-.875 < -0.60  true

-.875 > -0.50  false

-14/16 > - 15/16 true

-7/8 < - 2/8true

Answer:

brackets stand for multiplication therefore this means multiply 5.9 by 1.102..

I hope this helps and sorry if it's wrong

the question is not clear.

Answer: There isn't enough information to answer this

Step-by-step explanation:

starting pt.

root 16²+15²

= 256 + 225

=481

Answer:

Step-by-step explanation:

Because those 2 lines are parallel, then 2x + 10 and 2x - 30 are same side interior and are supplementary. Therefore,

2x + 10 + 2x - 30 = 180 and

4x - 20 = 180 and

4x = 200 so

x = 50

Answer:

x = 50

Step-by-step explanation:

Two Parallel lines and an transversal.

Given angles are co - interior angles and they are supplementary.

2x + 10 + 2x - 30 = 180

2x + 2x + 10 -30 = 180   {Combine like terms}

4x - 20 = 180  

4x = 180 + 20     (Add 20 to both sides}

4x = 200              {Divide both sides by 4}

x = 200/4

x = 50

Answer:

Step-by-step explanation:

Intersection means that the sets have terms in common

(5, 14, 22) are the common terms.

Answer:

A ∩ B  = { 5,14,22}

Step-by-step explanation:

Intersection is where the two sets meet, or what they both have in common

Set A : {1, 5, 10, 14, 22} Set B : {5, 14, 20, 22, 27}

Set A intersect B has 5 , 14 and 22 in common

A ∩ B  = { 5,14,22}

Answer:

C. [tex]4\sqrt{7} -4x\sqrt{7}[/tex] is correct

Steps:

[tex]4\sqrt{7} -3\sqrt{7}x-x\sqrt{7} \\\\4\sqrt{7} -3\sqrt{7} x-\sqrt{7} x\\\\4\sqrt{7} +(-3\sqrt{7} x-\sqrt{7} x)\\\\4\sqrt{7} -4\sqrt{7} x[/tex]

Answer:

C. 4√7 - 4x√7

Step-by-step explanation:

4√7 - 3x√7 - x√7

combine like terms

4√7 - 4x√7

Answer:

Step-by-step explanation:

let the horizontal distance be x

(17.8-1.5)/x = tan 38

or x = 16.3/tan38

or x = 20.863

The opposite angles in a cyclic quadrilateral are supplementary. i.e., the sum of the opposite angles is equal to 180˚

So using theorem we find that

∠A+∠C = 180

x + 108 = 180

x = 180 - 108

x = 72

∠B+∠D = 180

88 + y = 180

y = 180 - 88

y = 92

Answered by Gauthmath must click thanks and mark brainliest

The required value of angle x and angle y is 72 and 92 respectively.

Given that,
A figure of the circle has been shown,
A quadrilateral is inscribed in the circle,
Angles in the quadrilateral are given as
∠A = x, ∠B = 82, ∠C = 108 and ∠y
The value of angles x and y is to be determined.

A quadrilateral is an irregular four-sided shape as given in the picture in question.

Since quadrilateral has a property that describes that the sum of opposite angle of the quadrilateral is 180°,
Here in the given quadrilateral sum of angle A + C and angle B + D is equal to 180.
⇒
∠A + ∠C = 180
∠A + 108 = 180
∠A = 72°
Similarly
∠B + ∠D = 180
88 + ∠D = 180
∠D = 92

Thus, the required value of angle x and angle y is 72 and 92 respectively.

Learn more about quadrilateral here: https://brainly.com/question/13805601

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Answer:

-71/25

Step-by-step explanation:

We can use the slope formula when given two points

m = (y2-y1)/(x2-x1)

m = (86-15)/(1 -26)

   = 71/-25

  = -71/25

Answer:

[tex]\displaystyle m = \frac{-71}{25}[/tex]

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Algebra I

Step-by-step explanation:

Step 1: Define

Identify

Point (26, 15)

Point (1, 86)

Step 2: Find slope m

Simply plug in the 2 coordinates into the slope formula to find slope m

The distance between the intercepts of both lines is 2 units

The equation of a line in slope intercept form is:

[tex]y = mx + b[/tex]

Where:

[tex]m \to[/tex] slope

[tex]b \to[/tex] y intercept

For the first line, we have:

[tex]m_1 = 3[/tex] ---- the slope

So, the equation of the first line is:

[tex]y = 3x + b_1[/tex]

For the second line, we have:

[tex]m_2 = 5[/tex] --- the slope

So, the equation of the second line is:

[tex]y = 5x + b_2[/tex]

Both lines intersect at (10,15) means that (10,15) is a common solution to the equation of both lines

i.e.

[tex](x,y) = (10,15)[/tex]

Substitute these values in the first equation and solve for b

[tex]y = 3x + b_1[/tex]

[tex]15 = 3*10 + b_1[/tex]

[tex]15 = 30 + b_1[/tex]

[tex]b_1 = 15 - 30[/tex]

[tex]b_1 = -15[/tex]

So, the equation of the first line is

[tex]y = 3x - 15[/tex]

Repeat the same process for the second line

[tex]y = 5x + b_2[/tex]

[tex]15 = 5*10 + b_2[/tex]

[tex]15 = 50 + b_2[/tex]

[tex]b_2 = 15 - 50[/tex]

[tex]b_2 = -35[/tex]

So, the equation of the second line is

[tex]y =5x - 35[/tex]

The x intercept is when [tex]y =0[/tex]

So, we substitute 0 for y and solve for x in the equations of both lines

For line 1

[tex]y = 3x - 15[/tex]

[tex]0 = 3x - 15[/tex]

[tex]3x= 15[/tex] ---- Collect like terms

[tex]x = 5[/tex] --- Divide both sides by 3

The x intercept of line 1 is 5

For line 2

[tex]y =5x - 35[/tex]

[tex]0 = 5x - 35[/tex]

[tex]5x = 35[/tex] --- Collect like terms

[tex]x = 7[/tex] -- Divide both sides by 5

The x intercept of line 2 is 7

The distance (d) between both is the difference in the intercepts:

[tex]d = 7 - 5[/tex]

[tex]d = 2[/tex]

Read more about intercepts at:

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Answer:

D

Step-by-step explanation:

Answer:

It's D on there

Step-by-step explanation:

If AC=10 inches and CB=5 inches what is AB...

now, AB= AC+CB

= 10+ 5

=15 inches......

hope it helps you.have a nice day/ night...........

Answer:

It depends on the positions of the points.

Step-by-step explanation:

Since there is no figure, we cannot tell what the correct answer is since there is more than one possibility.

Here is one valid possibility.

                                   10                     5

<----------------+--------------------------+------------+--------------------->

                    A                             C              B

Here we have point C between points A and B. Then according to the definition of a point between two points, we have AB = AC + CB.

AB = AC + CB

AB = 10 + 5

AB = 15

Here is another equally valid possibility.

                   <----------- AC = 10----------------->

                                                          5

<----------------+--------------------------+------------+--------------------->

                    A                             B              C

Here we have AC = 10 and CB = 5, but we have point B between points A and C. According to the definition of a point in between two points, we have AC = AB + CB

10 = AB + 5

AB = 5

AB may be 10 or 5 depending on the order of the points on the number line. That makes the problem ambiguous without a figure.

Answer:

the land of seven is a person that has a unique and the world

The inequality that relates the number of hours to the weekly sales is:

[tex]450 + 0.20x \ge 35y[/tex]

The complete question implies that we define an inequality that represents the relationship between the number of hours worked in a week and the weekly sales

We make use of the following representation:

[tex]x \to[/tex] weekly sales from cars.

[tex]y \to[/tex] hours worked in a week

His weekly salary is then calculated as:

Salary (S) = Earnings per week + Commission * Sales from car

So, we have:

[tex]S = 450 + 20\% * x[/tex]

Express percentage as decimal

[tex]S = 450 + 0.20* x[/tex]

[tex]S = 450 + 0.20x[/tex]

Assume he works for y hours in a week.

His hourly rate is:

[tex]Hourly = \frac{S}{y}[/tex] --- i.e. weekly salary divided by number of hours

[tex]Hourly = \frac{450 + 0.20x}{y}[/tex]

For this rate to be at least [tex]\$35[/tex], the following condition must be true

[tex]Hourly \ge 35[/tex] --- i.e. is hourly rate must be greater than or equal 35

So, we have:

[tex]\frac{450 + 0.20x}{y} \ge 35[/tex]

Multiply both sides by y

[tex]450 + 0.20x \ge 35y[/tex]

Learn more about inequality:

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Answer:

The answer is  x = 2y

Step-by-step explanation:

(3x + 2y) (3y + 2 y)

3x = 3y + 2y + 2y

3x = 7y

x = 7 ÷ 3

x = 2y

Answer:

(x + 4) - 3

Step-by-step explanation:

Let the number be x

(x +4) - 3

Answer:

OPTION 1

Step-by-step explanation:

A function has exactly 1 output for every input option 1 is the only one where every x value corresponds to exactly 1 y-value.

Answer:

8z - 1

Step-by-step explanation:

Given

3 + 4(2z - 1) ← multiply each term in the parenthesis by 4

= 3 + 8z - 4 ← collect like terms

= 8z - 1

Answer:

-1 + 8z

Step-by-step explanation:

First use the distributive property of multiplication (Just multiply 4 with all numbers in the parenthesis):

3 + 4(2z - 1)

3 + 8z - 4

Group like terms:

3 + 8z - 4

-1 + 8z

The answer is -1 + 8z

Hope this helped.