cho tam giác DEF cân tại D có đường trung tuyến DI
a) Chứng minh tam giác DEI = tam giác DFI
b) Các góc DIE và góc DIF là góc gì

Answers

Answer 1
Can u translate yo English pls

Related Questions

11. Find the amount of interest on $600, if a bank is paying 5.5% interest.
[A] $30 [B] $3.30
[C] $330
[D] $33
[E] $23

Answers

B) 3.30 Since 600/100= 6 x 5.5= 3.30
B 3.30 is the answer

If two angles have the same angle measure, then they are said to be____.

A. Complementary
B.adjacent
C.congruent

Answers

Answer:

C

Step-by-step explanation:

2 equal angles are said to be congruent

Congruent angles have the same measure is answer is C

the graph of F(x) can be stretched vertically and flipped over the x axis to produce the graph of G(x) if F(x)=x^2 which of the following could be the equation of G(x)

A. G(x)=-1/5x^2
B. G(x)=-5x^2
C. G(x)=5x^2
D. G(x)=1/5x^2

Answers

Answer:

g(x) = -5x²

(option B)

Step-by-step explanation:

we know that our original graph, f(x) = x² is a parabola.

So, we can consider what happens when we adjust the function/equation of a parabola.

when we "vertically stretch" a parabola, we are increasing the value of x.

 think of it this way: the steepness of a slope is rise over run. If we rise ten, and run one, that's going be a lot more steep than if we rise 1, run 1.

Let's say our x = 5

if f(x)=x²

f(5) = 25

> y value / steepness is 25

f(x) = 3x²

f(5) = 75

 > y value / steepness is 75

So, we are looking for an equation with an increase in x present.

When a parabola has been flipped over the x-axis, we know that the original equation now includes a negative

suppose that x = 1

if y = x² ; y = 1² = 1

if y = -(x²) ; y = -(1²) ; y = -1

So, when we set x to be negative, we make our y-values end up as negative also (which makes the graph look as if it has been flipped upside-down)

This means that we are looking for a function with a negative x value.

So, we are looking for a negative x-value that is multiplied by a number >1

The graph that fits our requirements is g(x) = -5x²

hope this helps!!

Write the algebraic expression for the following statement.

The sum of a number and 3 is 14.

Answers

Answer:

the algebraic expression is; x+3=14

The radius of a circle is 7 metres. What is the length of a 135° arc?

Answers

Answer:

16.5 meters

Step-by-step explanation:

The length of an arc of a circle = 2πr(C/360°) ;where:

C is the central angle of the arc,

R is the radius of the arc

Length of the arc = 2π(7)(135/360)

= 16.493

= 16.5 metres (approx.)

Answer:

Arc Length: 5.25π or [tex]\frac{21}{4} \pi[/tex]

Explanation:

An arc is the part of the circumference of a circle.

Formula:

[tex]\sf Arc \ Length = \dfrac{\theta}{360} \ \times \ 2\pi \ \times radius[/tex]

If applied:

[tex]\sf Arc \ Length = \dfrac{135}{360} \ \times \ 2\pi \ \times 7[/tex]

[tex]\sf Arc \ Length = \dfrac{3}{8} \ \times \ 14\pi[/tex]

[tex]\sf Arc \ Length = \dfrac{21}{4} \pi[/tex]

[tex]\sf Arc \ Length = 5.25 \pi[/tex]

What is the transformation of C(9, 3) when dilated with a scale factor of 1/3,
using the point (3, 6) as the center of dilation

Answers

The transformation of C(9, 3) when dilated with a scale factor of 1/3, using the point (3, 6) as the center of dilation would be an option B: C'(3,1).

What is Dilation transformation?

A dilation transformation is a transformation that changes the size of the original figure but the shape remains unchanged.

If any figure is dilated by a scale factor k with the center of dilation as the origin.

Then the change of transformation in each of the vertices of the figure is given:

(x,y) → (kx, ky)

It is given a point C which is located at C(9,3).

Hence, here k=3

We get:

C(9,3) → C'(9×3,3×3)

C(9,3) → C'(27,9) = C'(3,1)

Hence, the transformation of C(9, 3) when dilated with a scale factor of 1/3, using the point (3, 6) as the center of dilation would be an option B: C'(3,1).

Learn more about dilation;

https://brainly.com/question/6639345

#SPJ1

Answer:

(5,5)

Step-by-step explanation:

count from the center

PLEASE ANSWER ASAP!!!!!11
The nth term of a sequence is represented by 2n^3+25n^2+32n−15/ 6n^4+2n^3−11n^2−2n+17.

What is the limit of the the nth term as x becomes increasingly large?

A. 0
B. 1/3
C. 3
D. The limit does not exist

Answers

The limit of the nth term of a sequence does not exist option (D) is correct.

What is the limit?

A limit is a value at which a function approaches the output for the given values in mathematics. Limits are used to determine integrals, derivatives, and continuity in calculus and mathematics.

We have an expression:

[tex]= \rm \dfrac{2n^5+25n^2+32n-15}{6n^4+2n^3-11n^2-2n+17}[/tex]

Applying limit:

[tex]= \lim_{n \to \infty} \rm \dfrac{2n^5+25n^2+32n-15}{6n^4+2n^3-11n^2-2n+17}[/tex]

[tex]=\lim _{n\to \infty \:} n \left(\dfrac{2+\dfrac{25}{n^3}+\dfrac{32}{n^4}-\dfrac{15}{n^5}}{6+\dfrac{2}{n}-\dfrac{11}{n^2}-\dfrac{2}{n^3}+\dfrac{17}{n^4}}\right)[/tex]

= ∞ = The limit does not exist

Thus, the limit of the nth term of a sequence does not exist option (D) is correct.

Learn more about the limit here:

brainly.com/question/8533149

#SPJ1

factoris fully 2ab² + 8a²b​

Answers

Answer:

2ab(b + 4a​)

Step-by-step explanation:

2ab² + 8a²b​

Factor Out the 2:

2(ab² + 4a²b​)

Factor Out the a:

2a(b² + 4ab​)

Factor Out the b:

2ab(b + 4a​)

8) Mark ran a mean distance of 13.2 km in five days. The next day, Mark ran 20 km.
Find the mean distance Mark ran in the six days.

Answers

Answer:

16.6

Step-by-step explanation:

Add the numbers together.

13.2+20=33.2

Now divide the number by 2.

33.2/2=16.6

Hope this helps!

If not, I am sorry.

Choose any set of Pythagorean triplets of your choice and illustrate them using graph sheet.
Example given below:

Answers

The required Pythagorean triplets are hypotenuse, perpendicular and base is 13, 12 and 5 respectively.

What are Pythagorean triplets?  

In a right angled triangle, its side, such as hypotenuse, perpendicular and base  is Pythagorean triplets.

We have

Hypohypotenuse = 13
perpendicular = 12
base = 5
Which satisfies the condition of the Pythagorean theorem.

[tex]a^2+b^2=c^2\\12^2+5^2=c^2\\169=c^2[/tex]

and c = 13

Thus, the required value of Pythagorean triplets satisfies the Pythagorean theorem.  

Learn  more about Pythagorean triplets here:
https://brainly.com/question/22160915

#SPJ1
 

 

find the equation of the arithmetic sequence in which t(5)=40 and t(10)=70.

Answers

The equation of the arithmetic sequence in which  t(5)=40 and t(10)=70 is tₙ = 10 + 6n

How to find the equation of an arithmetic sequence?

The equation of an arithmetic sequence can be represented as follows;

tₙ = a + (n  -1)d

where

a = first termd = common differencen = number of terms

Hence,

70 = a + 9d

40 = a  + 4d

30 = 5d

d = 30 / 5

d = 6

Therefore,

40 = a + 4(6)

40 - 24 = a

a = 16

Hence, the equation is as follows:

tₙ = 16 + (n - 1)6

tₙ = 16 + 6n - 6

tₙ = 16 - 6 + 6n

tₙ = 10 + 6n

learn more on arithmetic sequence here: https://brainly.com/question/18269451

#SPJ1

X^2 + y^2 = 81 write down the equations of the two horizontal lines that are tangent to c

Answers

Answer:

Step-by-step explanation:

x² + y² = 81

x + y = √81

x + y = 9

x ≥ 9

y ≤ 9

In the equation 17x2 = 12x, the value of c is:
17
12
0

Answers

Answer: 0

Detailed Explanation:

General Form of a Quadratic Equation :-

=> ax^2 + bx + c = 0

a = Coefficient of x^2
b = Coefficient of x
c = Constant Term

In the Given Equation :-

17x^2 = 12x
17x^2 - 12x = 0
=> 17x^2 - 12x + 0 = 0

Therefore,
a = 17
b = -12
c = 0

Hence, value of ‘c’ = 0

Mara found the length of time of an investment. The principal of the investment was $4,300, the interest rate was 6.2 percent, and the interest was $2,666. Mara made an error in her work.

I = p r t. 2666 = (4300) (0.062) t. 2666 = (266.6) t. StartFraction 266.6 over 2666 EndFraction = t. 0.1 = t.

What was Mara’s error?
Mara did not substitute the values from the problem into the formula correctly.
Mara did not multiply correctly.
Mara did not divide correctly.
Mara divided when she should have multiplied.

Answers

The error that Maria made is that she did not divide correctly.

What error did Maria make?

The simple interest that is paid on an amount of money is a function of the amount deposited, time and interest rate.

Simple interest = principal x time x interest rate

2666 = 4300 x 0.062 x t

2666 = 266.60t

t = 2666 /  266.60

t = 10 years

To learn more about simple interest, please check: brainly.com/question/27328409

#SPJ1

Identify the equation with an x-intercept of 3 and a y-intercept of -2.

Answers

The equation of line is 2x  - 3y = 6.

What is intercept?

The x-intercept is the point where a line crosses the x-axis, and the y-intercept is the point where a line crosses the y-axis.

The x-intercept is 3 and the y-intercept is -2.

So, the line passes through the points  (3, 0) and (0, -2)

Now, slope of line is

m= -2-0/ 0-3 = 2/3

Equation of line is

y = 2/3 x - 2

y = 2x-6 /3

3y= 2x -6

2x  - 3y = 6

Learn more about intercept here:

https://brainly.com/question/14180189

#SPJ1

What is the factored form of the following expressions?

x2 – x – 42

Answers

Answer:

(x-7)(x+6)

Step-by-step explanation:

2x * -42= -84x
So you find what is common between the two then fix it

2.865; cut it to the ten thousandths

Answers

Answer:

2.865.

Step-by-step explanation:

first get to know the place value of each digit is you move on you will realise that there's no digit for tens of thousands that means that you can add a zero which which will be counted as tens of thousands and since it's not past 5 it can't change the other number. I mean it can't add 1 to 5 so the number remains 2.865 good day.

Figure 1 is similar to figure 2. What is TS?
1 unit
4 units
8 units
2 units​

Answers

Answer:

8 units

Step-by-step explanation:

ratios  

(x-3) /( x+1)  = (x-2)/(x+3)     cross multiply

x^2 -x -2 = x^2 - 9

  -x - 2 + 9 = 0

    x = 7          

           so TS = x + 1 = 8 units

Quick please!!! Buford, the farm hand, is preparing feed for
the animals. He wants to mix the contents of a
bag containing 50% corn with one containing
90% corn to optain a 30-pound bag containing
80% corn. How many pounds of the 50% bag
should he use? (write your answer as a
decimal.)

Answers

Buford should use 7.5 pounds of the 50% corn bag.

How do we solve a system of linear equations from word problems?

A system of linear equation is an equation containing two different equations with variables and the coefficient.

From the given information, let:

The weight of the bag containing 50% corn be = xThe weight of the bag containing 90% corn be = y

Sp, we can a system of a linear equation that says:

x + y = 30

0.5x + 0.9y = 0.8(30)

Using elimination method

x + y = 30

-

x - 1.8y = -48

0 - 0.8y = -18

y = 18/0.8

y = 22.5

From x + y = 30

x = 30 - 22.5

x = 7.5

Therefore, we can conclude that he should use 7.5 pounds of the 50% corn bag.

Learn more about the system of the linear equations here:

https://brainly.com/question/2226590

#SPJ1

Write a system of equations that could be used to solve the situation described below.

You find 12 coins under the couch. Every coin is either a nickel or a penny, and they add up to a total of 32 cents. How many of each type of coin do you have? Let x represent the number of pennies and y represent the number of nickels.

Please select the best answer from the choices provided

A. x+y=12
0.05x+0.01y=0.32

B. x+y=0.32
0.01x+0.05y=12

C. x+y=12
0.01x+0.05y=0.32

D. not enough information

Answers

If there are 12 coins under the couch and every coin is either a nickel or a penny and together they are forming 32 cents then the equations which represent the problem will be x+y=12, 0.01x+0.05y=0.32. The correct option is B which is x+y=12, 0.01x+0.05y=0.32.

Given There are 12 coins and total money is 32 cents.

Let the number of pennies be x and the number of  nickels be y.

According to question there are 12 coins so the first equation becomes:

x+y=12.

Then we have been told that together they amount to 32 cents.

We know that 1 penny is 1 cent coin and 1 nickel is 5 cent coin so the equation becomes :

1*x+5*x=32

x+5y=32

converting into dollar

0.01x+0.05y=0.32.

Hence the right equations showing the problem of nickel and pennies are x+y=12, 0.01x+0.05y=0.32.

Learn more about equations here https://brainly.com/question/2972832

#SPJ10

please place the dot for me(20 points will give brainliest!!!)

Answers

Answer:

2,

Step-by-step explanation:

The vertex is the very highest or very lowest point. X coordinates are listed first, then Y.

What type of relationship is expressed below?
5x = 2x 9
O equation
O function
O inequality

Answers

Equation. A function has at least 2 variables: an output variable and one or more input variables. An equation states that two expressions are equal, and it may involve any number of variables. Inequality is more of < > equation.

Probability of Next Candy
Fill in the chart below with the probability of choosing the next candy.

Answers

Answer:

8 is correct.

Mark as brainlist, thanks me, and rate. Hope it helps you!!!

experimental verification​

Answers

See below for the verification of ∠ACD =  ∠ABC + ∠BAC

How to verify the angles?

The following proof works for both triangles.

The sum of angles in a triangle is 180 degrees.

So, we have:

∠ABC + ∠BAC + ∠ACB = 180

Make ∠ACB the subject

∠ACB = 180 - ∠ABC - ∠BAC

The sum of angles on a straight line is 180 degrees.

So, we have:

∠ACD + ∠ACB = 180

Make ∠ACB the subject

∠ACB = 180 - ∠ACD

Substitute ∠ACB = 180 - ∠ACD in ∠ACB = 180 - ∠ABC - ∠BAC

180 - ∠ACD = 180 - ∠ABC - ∠BAC

Subtract 180 from both sides

- ∠ACD = - ∠ABC - ∠BAC

Multiply both sides by -1

∠ACD =  ∠ABC + ∠BAC

Hence, ∠ACD =  ∠ABC + ∠BAC has been verified

Read more about proofs at:

https://brainly.com/question/24839702

#SPJ1

In triangle PQR, find the measure of angle Q.
P= 64 degrees
Q= X
R= 2x

Answers

Answer:

38.667°

Step-by-step explanation:

the total sum of 3 angles in a triangle is 180

in triangle PQR this means:

P+Q+R = 180

so:

64+x+2x=180

64+3x=180

3x=116

x=116/3=38.667

So Q=X=38.667

Simplify 10√3x +4√3x +5√3x

Answers

Add the like terms :

10√3x + 4√3x + 5√3x

(10 + 4 + 5)√3x

19√3x

Elaine saw statistics showing that union employees make an average of 30 percent more than nonunion workers, so when she was looking for a new job, she looked for one at a company that was unionized. Elaine was motivated by

Answers

Elaine saw statistics showing that union employees make an average of 30 percent more than nonunion workers, so when she was looking for a new job, she looked for one at a company that was unionized. Elaine was motivated by Economic needs.

What do we mean by economic needs?

By economic need Elaine is trying to get a company that would pay her more. Hence the need to go for the Unionized company.

This is given that the Unionized company is said to earn more than the other company. Hence her motivation is due to her economic needs.

Read more on economic needs here:

https://brainly.com/question/17889008

#SPJ1

what is 2(5+34-67/45*43)^2 equal to?

Answers

The value of the give expression is  [tex]\frac{313}{748845}[/tex] OR 4.18 × 10⁻⁴

Evaluating an Expression

From the question, we are to determine the value of

2(5+34-67/45*43)^2

This can be written as

[tex]2 (\frac{5+34-67}{45 \times 43 })^{2}[/tex]

First, we will simplify the bracket

[tex]2 (\frac{-28}{1935 })^{2}[/tex]

Then, we get

[tex]2 \times \frac{-28}{1935 }\times \frac{-28}{1935 }[/tex]

= [tex]\frac{1568}{3744225}[/tex]

= [tex]\frac{313}{748845}[/tex] OR 4.18 × 10⁻⁴

Hence, the value of the give expression is  [tex]\frac{313}{748845}[/tex] OR 4.18 × 10⁻⁴

Lear more on Evaluating an expression here: https://brainly.com/question/23133222

#SPJ1

What is the slope-intercept equation of the line below?

Answers

Answer:

y= 2x - 3

Step-by-step explanation:

To calculate the slope (or gradient) of a line, take two points on the line whose x and y values are easy to read. Then divide the difference of they y-coordinate values by the difference of their x-coordinate values.

Here I have taken the points p (3, 3) and q (1, -1) to calculate the slope.

• slope = [tex]\frac{y_{2} - y_{1} }{x_{2} - x_{1}}[/tex]

         = [tex]\frac{3 - (-1)}{3 - 1}[/tex]

         = [tex]\frac{4}{2}[/tex]

         = 2  

The intercept is the y-coordinate value of the point at which the line crosses ("intercepts") the y-axis. I've marked the intercept point with a green line.

• intercept = -3

The slope-intercept equation of a line takes the form:

y = mx + c

where 'm' is the slope and 'c' is the y-intercept.

Substituting the values we found into the equation gives us:

y = 2x + (-3)

y = 2x - 3

Find the x-intercept of the rational function.

A (-5,0)
B (0,-5)
C (0, -1)
D (-1, 0)

Answers

Answer:

(-5,0)

Step-by-step explanation:

The x intercept is where it crosses the x axis

It crosses the x axis where x = -5

The y value is 0

(-5,0)

Answer:

A  

Step-by-step explanation:

The x -intercept is 'shorthand' for  x - AXIS intercept

  where the graph crosses the x - axis

      this will always have a   ZERO  value for the 'y'- coordinate

looking at the graph this point is   -5,0

Other Questions
Central idea of Hispanic heritage flashback Friday by Rebecca Sutton How many grams of NaCl can be created from 9.8 moles of HCl? (molar mass of NaCl= 58.44g, HCl=36.46g) Please find the area of the given picture. Please as fast as possible........ How did the economic philosophy of John Maynard Keynes differ from classical economists?A) Keynes believed that governments should only control monetary policy while the classicists believed in wage and price control.B) Keynes believed that governments could intervene to restart the economy while the classicists believed in market self-correction.C) Keynes believed that motivated industries would restart the economy by providing jobs while the classicists believed in waiting.D) Keynes believed that governments should not intervene to restart the economy while the classicists believed in spending and tax cuts. Spock Enterprises has a market value of $100 million in debt outstanding. They also have a market value of equity of $400 million. Shareholders require a 12% return on their shares and creditors require a 7% before-tax return on their investment. The weighted average return required by investors in Spock Enterprises is Blank______%. The length of a rectangle is 8 cm more than four times the width. If the perimeter of the rectangle is 46 cm, what are the dimensions? Use trigonometric identities to verify each expression is equal. c) csc^2(x)-2csc(x)cot(x)+cot^2(x) = tan^2(x/2) d) [cos(x)cos(y)][tan(x)+tan(y)] = sin(x+y) Which statement is true about the energy of electromagnetic radiation?A. The frequency of the emitted radiation is inversely proportional to its energy.B. The frequency of the emitted radiation is directly proportional to its energy.C. The wavelength of the emitted radiation is directly proportional to its energy.D. The amplitude of the emitted radiation is inversely proportional to its energy. On a number line, 6.87 would be located6.87A. To the right of 6.81B. Between 6 and 6.5C. Between 6.5 and 7D. To the left of 6.81Check all that apply. There are 5 white balls. 8 red balls, 7 yellow balls, and 4 green balls in a container. A ball is chosen randomly. Find the probability of the following events.1.What is the probability of choosing green?Answers:________ work space:______2. What is the probability of choosing red?Answers:________ work space:______3. What is the probability of choosing neither white nor green?Answers:________ work space:_______4. . What is the probability of choosing other than yellow?Answers:________ work space:_______5. What is the probability of choosing purple?Answer:_________ work space:_______ Discuss the relationship between bond prices and interest rates. What impact do changing interest rates have on the price of long-term bonds versus short-term bonds? Your answer must be supported with examples and academic citations. Choose the correct way to complete the paragraph about evaluating an argument. when researchers gather information from sources, its important that they evaluate the arguments the authors of these sources make. researchers must consider to ensure that authors present a balanced argument. they must always examine the evidence presented. researchers should be wary of authors who do not use varying types of evidence or those who rely heavily on and opinions. researchers must also pay close attention to logic and . How does the soothsayer, a minor character,advance the plot of the play in this excerpt?CAESARThe ides of March are come.SOOTHSAYERAye, Caesar, but not gone.O The line foreshadows the dangers to come.O The line supports the theme that you cannot escapeyour fate. What is the empirical formula for the molecular formula given? Molecular formula: C5H12O A cyclist is stationary when a second cyclist passes travelling at a constant speed of 8 m s1. The first cyclist then accelerates for 5 s at a constant rate of 2 m s1 before continuing at constant speed until overtaking the second cyclist. By sketching both graphs, find the equations of the two straight line sections of the graphs and hence find how long it is before the first cyclist overtakes the second. what historical event is going on in athens at the time that euripides herakles was first produced that might explain euripides' thematic interest in civil strife and tyranny? Determine the intervals on which the function is (a) increasing; (b) decreasing: (c) constant.(a) The function is increasing on the interval(s)(Use a comma to separate answers as needed. Type your answer in interval notation.) Two force of 20N and 40N act at aPoint and the angle between them is 50 degrees.Find the resultant force Find the direction using sine rule What is the common uses of bases Which of these is an advantage of an MRI over an X-ray?A. It shows only external structures.B.It uses no radiation.C. It requires large equipment.D.It produces better images of hard tissues.