find the measure of a line EC​

Find The Measure Of A Line EC

Answers

Answer 1

9514 1404 393

Answer:

  41

Step-by-step explanation:

The product of segment lengths from the point of intersection to the circle is the same for both chords.

  QC·QE = QD·QF

  2x(21) = (x+4)(30)

  14x = 10(x +4) . . . . . divide by 3

  4x = 40 . . . . . . . . . . subtract 10x

  x = 10 . . . . . . . . . . . .divide by 4

  2x +21 = EC = 2(10) +21 . . . . . find EC

  EC = 41


Related Questions


The linear regression equation for a data set is y=1.6x-4.1. If the actual value at x=3 is 0.9,
what is the residual value at x=3?

Answers

Answer:

0.2

Step-by-step explanation:

Given the regression model :

y = 1.6x - 4.1

At x = 3

Predicted value = 1.6(3) - 4.1 = 0.7

If actual value at x = 3 is 0.9

The residual value at x = 3 ;

Residual value is the difference between the actual and predicted value :

Actual at x = 3 minus predicted at x = 3

Hence, Residual = 0.9 - 0.7 = 0.2

Residual is the difference between the predicted value and the actual value of the response variable

The residual at x = 3 is 0.2

The linear regression is given as:

[tex]y = 1.6x - 4.1[/tex]

The predicted value at x = 3 is calculated by substituting 3 for x in the linear regression

So, we have:

[tex]y = 1.6 \times 3 - 4.1[/tex]

[tex]y = 4.8 - 4.1[/tex]

[tex]y = 0.7[/tex]

The actual value is given as 0.9.

So, the residual is calculated using:

[tex]Residual =Actual - Predicted[/tex]

This gives

[tex]Residual =0.9 - 0.7[/tex]

[tex]Residual =0.2[/tex]

Hence, the residual at x = 3 is 0.2

Read more about residuals at:

https://brainly.com/question/9315325

A school cafeteria sold 1,280 slices of pizza the first week, 640 the second week, and 320 the third week. If this pattern continues, in what week will the cafeteria sell 40 slices? Explain how you got your answer.

Answers

If you look at the question, You would see a pattern. That pattern is the amount of slices in one week is divided by 2 the next week. So on the fourth week you would do 320/2 and get 160. if you keep carrying on the pattern yourself, you would do: 160/2 = 80. 80/2 = 40. And there's your answer. week 4 we had 160 slices sold. week 5 80 slices sold. Week 6 40 slices sold

Simplify this into your own words if you have to

Sam saved $50 from his summer job to buy video games. He bought 3 video
games and the cashier gave him $12.80 in change. If each game cost the same
amount, how much was each video game?

Answers

Answer:

$12.40

subtract 12.80 from 50 to get 37.20 then divide by 3

What is the answer 1.4 ÷ 0.7 =

Answers

Answer: 2

Step-by-step explanation: 0.7 times 2 is 1.4

Answer:

2

Step-by-step explanation:

Graph y= -4/5x -7
Algebra

Answers

the person above answered already for you

Two horses start a race at the same time. Horse A gallops at a steady rate of 32 feet per second and Horse B gallops at a steady rate of 28 feet per second. After 5 seconds, how much farther will Horse A have traveled? Explain your reasoning. *

Answers

Answer:

Horse A will have traveled 20 feet farther

Step-by-step explanation:

Horse A has traveled 160 feet in 5 seconds, and Horse B has traveled 140 feet in 5 seconds, and 160-140=20

Which expression is equivalent to 2(x + 7) – 18x + 3?

Answers

Answer:-16x+17

Step-by-step explanation:

Help. I do not know pls I require assisstance

Answers

Answer:

-1 is not in domain

0 and 2 both are in domain.

Explanation:

The radical function must have the domain greater or equal to 0. Here is why.

If we substitute any negative numbers in the equation

[tex]y = \sqrt{x} [/tex]

Then we would get the Imaginary Number, meaning it doesn't exist in Real Number system. That's why any negative real numbers cannot be part of the domain.

But that's for y = square root of x. There are like 4 types of radical function but this one is for example.

The equation in the question is the same type as the example equation.

If a sweater costs $40.00 before the sale and $35.00 after the sale, what was the percent of decrease?

Answers

Answer:

%12.5

Step-by-step explanation:

Answer:

12%

Step-by-step explanation:

What is my perfect crime? I break into Tiffany's at midnight. Do I go for the vault? No, I go for the chandelier. It's priceless. As I'm taking it down, a woman catches me. She tells me to stop. It's her father's business. She's Tiffany. I say no. We make love all night. In the morning, the cops come and I escape in one of their uniforms. I tell her to meet me in Mexico, but I go to Canada. I don't trust her. Besides, I like the cold. Thirty years later, I get a postcard. I have a son and he's the chief of police. This is where the story gets interesting. I tell Tiffany to meet me in Paris by the Trocadero. She's been waiting for me all these years. She's never taken another lover. I don't care. I don't show up. I go to Berlin. That's where I stashed the chandelier.

5 = -8 + c
i need help this is extra credit

Answers

Answer:

c is equal to 13

because -8 + 8 is 0 and 0 + 5 is 5 and 8 + 5 is 13

The square of 15 is 225. The square of what other number is 225?

Answers

Answer:

-15

Step-by-step explanation:

-15²

= -15×-15

= 225

hope it helps!!

Answer:

-15

Step-by-step explanation:

Any number times itself is a positive number. The square of any number will be the same as the square of that number times -1

example:

2^2=4

-2^2=4

URGENT
The table shows the derivation of tan(2x). Select the
correct reason for each step.
Reason 1 is
Reason 2 is
Reason 3 is

Answers

Answer:

Reason 1 is: Addition

Reason 2 is: Tangent Sum Identity

Reason 3 is: Simplify

Step-by-step explanation: ED 2020

Answer:

Reason 1 is: Addition

Reason 2 is: Tangent Sum Identity

Reason 3 is: Simplify

Step-by-step explanation:

Connor has 36¢ in nickels and pennies. He has 8 coins altogether. How many coins of each kind does he have?

Answers

Answer:

7 nickels

1 pennie

Step-by-step explanation:

Answer:

Connor has 7 nickles and 1 penny.

Step-by-step explanation:

7 * 5 = 35

5 is the value of a nickel.

1 * 1 = 1

35 + 1 = 36

Therefore, Connor has 7 nickels and 1 penny.

Find the range of the function for the given domain.

f(x) = 3x -6;{-2,-1,0,1,2}

What is the range? Choose the correct answer below.

A. {-13, - 9,-6,-3,1)

B. {-12, - 8,-6,- 2,0}

C. {-12, - 8, -7,-2,0)

D. {-12,-9,-6,-3,0}

Answers

Answer:  D.  {-12, -9, -6, -3, 0}

=================================================

Explanation:

The domain is the set of allowed x inputs. The range is the set of possible y outputs.

The set {-2,-1,0,1,2} represents all the possible x inputs

Let's plug each of those into the equation y = 3x-6 to find the corresponding paired out puts.

Note: y = f(x), so f(x) = 3x-6 is the same as y = 3x-6.

---------------

If x = -2, then,

y = 3x-6

y = 3(-2)-6

y = -6-6

y = -12

We see that x = -2 and y = -12 pair up together.

The value -2 in the domain maps to -12 in the range.

----------------

If x = -1, then,

y = 3x-6

y = 3(-1)-6

y = -3-6

y = -9

The input x = -1 in the domain maps to the output y = -9 in the range

So far the range consists of {-12, -9} in either order.

The answer is between A and D

-----------------

If x = 0, then,

y = 3x-6

y = 3(0)-6

y = 0-6

y = -6

So -6 is also part of the range. We have {-12, -9, -6} so far. The answer is still between A and D.

------------------

If x = 1, then,

y = 3x-6

y = 3(1)-6

y = 3-6

y = -3

The range updates to {-12, -9, -6, -3}

A and D are still equally valid

-------------------

We have one more x value to try

If x = 2, then,

y = 3x-6

y = 3(2)-6

y = 6-6

y = 0

Since y = 0 is in the range, instead of y = 1, this rules out choice A

The answer is therefore D.  {-12, -9, -6, -3, 0}

Which theorem, term, or corollary is represented by the picture? The bold lines in the pictures represent the hypothesis of the theorem or corollary.


A. Corollary to the isosceles triangle theorem

B. Corollary to the converse of the isosceles triangle theorem

C. CPCTC

D. Isosceles triangle theorem

E. Converse to the isosceles triangle theorem

Answers

Answer:

Pictured is the equilateral triangle with 3 sides and 3 angles being same

This should be equilateral triangle theorem, but it is not captured by answer choices

1.Find the eqn of line passing through the point of intersection of lines 5x+y=7 and 3y=4x-5 and parallel to the line 2x-y=3​

Answers

Answer:

y = 2x - 259/115 [slope-intercept]

-230x + 115y = -259 [standard form]

Step-by-step explanation:

First make sure both of the intersecting lines are in standard form: Ax + By = C.

Then, multiply one of the equations by a certain quantity so one of the variables can be canceled out.

For example:

given 5x + y = 7, and 3y = 4x - 5.

You can rearrange the second equation since it is not currently in standard form.

So all we need to do is subtract both sides by 4x since that will leave the constant of C by itself.

3y = 4x - 5 → 3y - 4x = 4x - 5 - 4x →

3y - 4x = -5.

Now adding a negative number is the same as subtracting a positive number, this is because subtraction is the opposite of adding.

So 3y - 4x = -5 = 3y + (-4x) = -5 →

-4x + 3y = -5

Please help I’ll appreciate it thank you

Answers

107° because a line is 180 degrees and 180 minus 73 is 107

Answer:

107*

Step-by-step explanation:

assuming QOP is 73 degrees then NOP is 107 degrees

a straight like is 180* then - 73* = 107*

Last year Sarah invested money in two accounts. The first account had an interest rate of 4% and the second account had an interest rate of 3%. If she invested $700 more in the first account than the second and her total interest income was $483, how much did she invest at each rate?

Answers

Answer:

explain further pls so i can give u the correct answer

Step-by-step explanation:

chris types 350 words in 4 minutes. Which equation can be used to find w, the number of words chris can type in 20 minutes if he continues to type at the same speed rate?​

Answers

Answer:

Chris will type 7,000 words in 20 minutes. You can use 350 x 20 to find your answer.

Step-by-step explanation:

Digit realizes that some members of the audience cannot see the bride and groom due to the current seating arrangement. Therefore, the "U" shape in which the wedding party is organized needs to be widened so that the entire audience fits in between the outer boundaries of the "U" shape. In other words, the audience will be located above the upward-opened parabola formed by the bridal party.

What type of transformation is needed to widen the shape in which the wedding party is currently organized?

a dilation
a reflection
a translation
a rotation

Answers

Answer:

A dilation

Step-by-step explanation:

i

3x+7+10x=7+13x+10 has {fill in blank} solutions.

-6x-6+8x=-5+2x-1 has {fill in blank} solutions.

choices for both are
infinitely many,one,two,three

Answers

Answer and Step-by-step explanation:

3x + 7 + 10x = 7 + 13x + 10

13x + 7 = 13x + 17

0 = 10

No solutions

-6x -6 + 8x = -5 + 2x -1

2x - 6 = -6 + 2x

0 = 0

Many solutions.

The first equation has no solutions.

The second equation has infinitely many solutions.

#teamstrees #WAP (Water And Plant)

Answers:

1. No solutions

2. Infinitely many solutions

Step-by-step explanation:

[tex]3x+7+10x=7+13x+10[/tex]

Add common terms from both sides of the equation (10x and 3x) & (7 and 10)

[tex]13x+7=17+13x[/tex]

Subtract common terms from both sides (13x and 13x)

[tex]7\neq 17[/tex]

7 does not equal 17; thus, there are no solutions

[tex]-6x-6+8x=-5+2x-1[/tex]

Add common terms from both sides of the equation (-6x and 8x) & (-5 and -1)

[tex]2x-6=-6+2x[/tex]

Reorder the right side of the equation

[tex]2x-6=2x-6[/tex]

Since this is a true statement, there are infinitely many solutions

Help pls I need help asap

Answers

Gywaashjjfssrtjjyytttttttttnbddu a.

What is the origional price of an object if the total is 878.74 and the tax is 0.07.

My problem/find X

X × 0.07 =b
X + b =$878.78​

Answers

Answer:

The original price was $821.25

Step-by-step explanation:

The price of an object is $878.74 including a tax of 7%.

We are required to find the original price.

If the tax is 7%, then the total price is 100+7=107% of the original price.

Thus, $878.74 is the 107% of the original price x, thus:

x = $878.74/107*100 = $821.25

The original price was $821.25

how many times larger is 2.4 x 10^8 than 6 x 10^7?

Answers

The answer is 400 times!

which point on the line number line represntes -1/3​

Answers

Answer:

c

Step-by-step explanation:

Answer:

Aaaaaaaaa because -1/3=0.3333

What is the first digit quotient for 18.6


Please respond ASAP

Answers

I don’t know sorry I’m on the same one and can’t find it out

Answer: 18.6 is your answer because there is nothing behind the 6

Step-by-step explanation: hope this help :)

What is the volume of a hemisphere with a diameter of 56.7 in, rounded to the
nearest tenth of a cubic inch?

Answers

Answer:

Expert Verified

Step-by-step explanation:

the diameter is 57.2 in, then the radius is half that, or 28.6 in. The volume of a sphere is V = (4/3)πr³, and so the volume of this hemisphere is (2/3)πr³

The volume of the hemisphere given its diameter is 47,697.7 in³.

What is the volume?

The volume of an object is the amount of space that is in the object. A hemisphere is a three-dimensional object that has the shape of a semicircle.

The volume of the hemisphere = 2/3πr³

r = 56.7 / 2 = 28.35 in

2/3 x 28.35³ x 3.14 = 47,697.7 in³

To learn more about the volume of a hemisphere, please check: https://brainly.com/question/26840364

#SPJ2

C.P=Rs 20,S.P =Rs24,profit​

Answers

CP=RS20

SP=RS24

NOW ‚

Profit=SP-CP

=Rs24-Rs20

=Rs4

A board game was originally priced at $24, it is on sale now for $18. What percent off is the game (percent of
change)?

Answers

See attachment for your problem set up.

Answer:

This is a 25% decrease

Step-by-step explanation:

Find the difference between the two prices

24- 18 = 6

Take that over the original price

6 /24 = 1/4

Change to decimal form

.25

Change to percent form

25%

This is a 25% decrease

Consider the following triangle:
Part A:find the perimeter of the triangle:
Options__
1) 72^1/2+32^1/2+2.16^1/3
2) 72^1/2+32^1/2+32^1/3
3) 104^1/2+2.16^1/3
Part B: Ronnie correctly rewrote the perimeter using radicals. Which expression did he use?
1) √32+ √72+3^ √16
2) √32+ √72+ √16
3) √32+ √72+3^ √32
4) √32+ √72+2 3^ √16

Part c in graph...if you already know the answer for it..please let me know

Answers

Answer:

Part A: B

Part B: I think 3

Step-by-step explanation:

Simply for Part A, put all the numbers together and add them for 2*16^1/3, you just multiply the 2 and 16. For the second part, use process of elimination

HOPE THIS HELPS:

SSG

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