when is it hard to show if a set is closed or not closed?

Answers

Answer 1
One way to determine if you have a closed set is to actually find the open set. The closed set then includes all the numbers that are not included in the open set. For example, for the open set x < 3, the closed set is x >= 3. This closed set includes the limit or boundary of 3

Related Questions

help plz ^^^^^^^^^^!!!!!!!

Answers

Answer:

refer pic

sorry for messy handwriting

hope it help u and i appreciate if you give brainliests, thanks

(1+√5)/(3+√5) Surs and need all working as I do not know how to do this at all

Answers

[tex] = \frac{(1 + \sqrt{5}) }{(3 + \sqrt{5}) } \\ [/tex]

[tex] = \frac{(1 + \sqrt{5}) }{(3 + \sqrt{5} )} \times \frac{(3 - \sqrt{5} )}{(3 - \sqrt{5}) } \\ [/tex]

[tex] = \frac{1(3 - \sqrt{5}) + \sqrt{5} (3 - \sqrt{5} )}{ ({3})^{2} - { (\sqrt{5} })^{2} } \: \: [∵ {a}^{2} - {b}^{2} = (a + b)(a - b) ]\\ [/tex]

[tex] = \frac{3 - \sqrt{5} + 3 \sqrt{5} - 5 }{9 - 5} \\ [/tex]

[tex] = \frac{ - 2 + 2 \sqrt{5} }{4} \\ [/tex]

[tex] = \frac{2( - 1 + \sqrt{5} )}{4} \\ [/tex]

[tex] = \frac{ - 1 + \sqrt{5} }{2} \\ [/tex]

[tex]\large\mathfrak{{\pmb{\underline{\red{Mystique35 }}{\red{}}}}}[/tex]

Tom purchased a basketball game for $9.09, and a Pokemon game for $13.96
vith two $20 bills. How much change did Tom get?

Answers

Hello :D

2 x $20 = $40

$9.09 + $13.96 = $23.05

$40.00 - $23.05 = $16.95

The answer is $16.95. I hope this helps :)

Algebra
I need to work this out help me please

Answers

There must be more to the problem

HELP ASAP!!! A fruit juice company includes 1.117 ounces of orange juice in a 6.25-ounce bottle of a mixed fruit juice. How much of the bottle of mixed fruit juice is NOT orange juice

Answers

Answer:

Image result for 1.117 ounces of orange juice in a 6.25-ounce bottle of a mixed fruit juice. How much of the bottle of mixed fruit juice is NOT orange juice

In the US, reduced- acid orange juice is marketed to persons with sensitive stomachs. Orange juice concentrate can be bought with different ratios – typical values lie between 14 and 17. Juice acidity is measured using a chemical titration method. Orange juice contains acids that release hydrogen ions (H+) in solution.

Step-by-step explanation:

Each morning Tess chooses either a red ribbon or a blue ribbon at random to wear in her hair. What is the probability that Tess will choose a red ribbon on both Monday and Tuesday?​

Answers

Answer:

1/4 chance

Step-by-step explanation:

First you need to find the probability of Tess choosing a red ribbon.

1/2

Then you need to multiply that probability by the reciprocal of 2, which is 1/2

1/2 x 1/2 = 1/4

m∠WYX = (2x − 7)° and m∠WYZ = (3x + 2)°. If ∠WYX and ∠WYZ are complementary, what is the measure of each angle?

Answers

Answer:

m<WYX = 31°; m<WYZ = 59°

The measure of the angle ∠WYX and ∠WYZ will be 31° and 59°.

What is an angle?

The angle is the distance between the intersecting lines or surfaces. The angle is also expressed in degrees. The angle is 360 degrees for one complete spin.

Complementary angle - Two angles are said to be complementary angles if their sum is 90 degrees.

m∠WYX = (2x − 7)° and m∠WYZ = (3x + 2)°.

If ∠WYX and ∠WYZ are complementary, then the sum of the angles ∠WYX and ∠WYZ will be 90°.

Then the equation will be

∠WYX + ∠WYZ = 90°

2x - 7 + 3x + 2 = 90

             5x - 5 = 90

             5x = 90 + 5

             5x = 95

               x = 95 / 5

               x = 19

Then the measure of the angle ∠WYX will be

∠WYX = (2x − 7)°

∠WYX = (2 × 19 − 7)°

∠WYX = (38 − 7)°

∠WYX = 31°

Then the measure of the angle ∠WYZ will be

∠WYZ = (3x + 2)°

∠WYZ = (3 × 19 + 2)°

∠WYZ = (57 + 2)°

∠WYZ = 59°

The measure of the angle ∠WYX and ∠WYZ will be 31° and 59°.

More about the angled link is given below.

https://brainly.com/question/15767203

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Does #7 look right? Im struggling on this

Answers

yes that looks correct

Please solve all 6 questions and show work... I will mark you brainliest and rate you five stars

Answers

Answer:

17.

9x - 2 = 8x + 6 (opposite angles on the transversal)

9x - 8x = 6+2

x = 8

18.

-5 + 21x + 15x +5 = 180 (angles on the same side of transversal add up to 180)

36x = 180

x = 180/36

x = 5

19.

9x + 4 + 95 = 180  (angles on the same side of transversal add up to 180)

9x + 99 = 180

9x = 180-99

9x = 81

x = 81/9

x = 9

20.

16x - 2 = 110 (opposite angles on the transversal)

16x = 110 +2

16x = 112

x = 112/16

x = 7

21.

29x + 4 = 31x -4 (opposite angles on the transversal)

4 + 4 = 31x - 29x

2x = 8

x = 8/2

x= 4

22.

12x + 2 + 6x + 16 = 180(angles on the same side of transversal add up to 180)

18x +18 = 180

18x = 180-18

18x = 162

x = 162/18

x = 9

what is 9 subtracted from x

Answers

Answer:

x - 9

Step-by-step explanation:

Answer:

bguiyhvulcvougtjglctvtgulvugtfvufygbgl

Step-by-step explanation:

What is the ratio 1.6 kg: 120g lowest term?

Answers

Answer:

40:3

Step-by-step explanation:

1.6kg:120g

1600g:120g

1600:120

160:12

80:6

40:3

What is 2 plus 2 equal

Answers

Answer:

2 + 2 = 4

Step-by-step explanation:

Logically, the response of 2 + 2 = 4. This is because the sign in the problem is addition. Another way to look it,  If we have 2 oranges and have another 2 oranges we have four oranges.

What is (x)
9.4x+17.5

Answers

Answer: x=1.8617                                                                                                                                                                

Step-by-step explanation: 9.4x+17.5                                                                     9.4x/9.4=17.5/9.4                                                                                                     x=1.8617                                                                                                                                                                  

Fred's health insurance premium is $4635 annually.

If his employer pays 80% and he is paid monthly, how much is deducted from each monthly check?

Answers

Answer: $ 927

Step-by-step explanation:

20% is deducted from his check.

20/100 = x/4635 (cross multiplication)

= $927

The deducted amount for each month will be $77.25.

What is mean by Percentage?

A number or ratio that can be expressed as a fraction of 100 or a relative value indicating hundredth part of any quantity is called percentage.

Given that;

Fred's health insurance premium is $4635 annually.

And, His employer pays 80% and he is paid monthly.

Now,

Since, His employer pays 80% and he is paid monthly.

Hence, The percent of deducted salary = 20%

So, The deducted amount of each month = 20% of $4,635 / 12

                                                                = 20/100 × 4635 / 12

                                                                = $927 / 12

                                                                = $77.25

Thus, The deducted amount of each month = $77.25

Learn more about the percent visit:

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Find an expression which represents the sum of (8x + 10y) and (-4. – 3y) in
simplest terms.
Answer:
Submit Answer
attempt 1 out of 2

Answers

8x+7y-4 right answer !

which line has a slope of -3/4 and a y-int of 3/2? see photos

Answers

Answer: Self Guidance. A slope of -3/4 and a y intercept doesn't look like any of them

Step-by-step explanation:

A slope of -3/4 and a y-intercept of 3/2 looks like this. After, maybe you can try it on your own. Hope this helps

what will be the decimal expansion of irrational number??​

Answers

Answer:

the decimal expansion of an irrational number will be non terminating and non recurring

In a school library, 40% of the books are in Nepali language, 40% of the remaining books are in English and the remaining books are in regional languages. If the number of books in English language is 4800, find the total number of books in the library,​

Answers

Step-by-step explanation:

Solution,

Let the total number of books be x, then

Books in English language=4800

40% of x=4800

40/100×x=4800

40x/100=4800

40x=4800×100

40x=480000

x=480000/40

x=12000

So the total number of books in the library is 12000.

pls help finding X
thank you if u do (Pls do not spam i have this in my test so need to learn)

Answers

Answer: x= 26

Step-by-step explanation:

27+x+127 = 180(being linear pair)

or, x + 154 = 180

or, x = 180-154

so, x = 26

Answer:

26

Step-by-step explanation:

Here,

27+ 127+ x =180

154+ x = 180

x =180-154

x=26

hope it is helpful

Araba used ⅓of her salary on food and ⅖ on other items. If she saved the remaining amount of 240 cedis, how much is Araba's salary

Answers

Answer:

900

Step-by-step explanation:

1/3 + 2/5 = 11/15

4/15 = 240

4/15 x = 240

4x = 3600

x= 900

If f(x) = -8 - 5x, what is f(-4)

Answers

Answer:

f(- 4) = 12

Step-by-step explanation:

To evaluate f(- 4) substitute x = - 4 into f(x) , that is

f(- 4) = - 8 - 5(- 4) = - 8 + 20 = 12

f(x)=-8-5x

[tex]\\ \rm\longmapsto f(-4)[/tex]

Put -4 inplace of x

[tex]\\ \rm\longmapsto -8-5(-4)[/tex]

[tex]\\ \rm\longmapsto -8+20[/tex]

[tex]\\ \rm\longmapsto 12[/tex]

please help me with these questions I am begging anyone please help

(a)• production cost of a wooden cupboard is Rs.30,000.the manufacturer marked the price in order to obtain a 20% profit .if the payment is done outright 2% discount is given

questions


(1) what is the marked price of the cupboard?

(2) what is the outright price of the cupboard?

(3) find the price percentage gained by selling the cupboard for outright price ?

(b)• a furniture seller asks for 5% commission to sell 5 cupboard of Rs.35.000 each find the commission he receives



please help me ​

Answers

Answer:

1)rs.6000

Step-by-step explanation:

1)30 000*20/100=rs.6000

Sorry I don't know the answers for other questions cause I don't know outright price

How many cups of 15% juice
must be added to 10 cups of
20% juice so that the mixture is
17% juice?

Answers

Answer:

15 cups

Step-by-step explanation:

20% of juice has:

10*0.2 = 2 cups of extract

If x cups of juice added we'll have:

2 + x*0.15 = 0.17(10 + x)2 + 0.15x = 1.7 + 0.17x0.17x - 0.15x = 2 - 1.70.02x = 0.3x = 0.3/0.02x = 15

Use properties of real numbers to write the expression without parentheses. 6(x + y)

Answers

[tex]\boxed{\sf a(b+c)=ab+ac}[/tex]

[tex]\\ \sf\longmapsto 6(x+y)[/tex]

[tex]\\ \sf\longmapsto 6(x)+6(y)[/tex]

[tex]\\ \sf\longmapsto 6x+6y[/tex]

For the functions below, calculate the indicated function values.
(1 Point)
f (x) = x 8(x) = 5x - 12 h (x) = x2 + 4x - 7
Find f (10)
A. 10
B. 12
C. 38
Help!?

Answers

Answer:

10

Step-by-step explanation:

f(x)=x

subtitute 10 in the place of x:

f(10)=10

please someone help me I will mark you has brainiest​

Answers

Answer:

i angle EFB

ii BFC and AFC

Step-by-step explanation:

Answer:

i .angle AFC

iiAFC and AFB

I need help please, I’m confused!!

Answers

Answer:

(-6, 3)

Step-by-step explanation:

If you rotate the coordinates, (2, -3), 90° clockwise around the point, (1, 4), then it will become Point P' at (-6, 3). There isn't a very efficient way to explain this but since Point P is 7 units south and 1 unit east of (1, 4) we need to keep it the same distances away when we turn it 90°. You can use something like parchment paper, record the point you're turning it around, (1, 4), and the point to be turned, Point P at (2, -3). If you rotate it exactly 90° without ever moving the point on (1, 4), Point P should now be at (-6, 3) if that makes sense.

I will give brainiest whoever is right thanks :)

Answers

In order to find more equivalent ratios you must multiply by 2 or more. 2 is easiest so

(2)7 and (2)3= 14:6
Thats is one equivalent ratio now 2 more.

14(2) and 6(2)= 28:12

Last but not least

28(2) and 12(2)= 56:24

For the explanation: they are equal because we are multiplying the numbers by the same numbers which allow them to be increased at the same rate. It is like we are unsimplifying a fraction.

Baseball is a field of dreams

Answers

Answer:

the answer is b

Step-by-step explanation:

i did this alrdy

find the two number whose A.M is 5 and G.M is 4​

Answers

Answer:

2 and 8

Step-by-step explanation:

let the numbers be x and y , then

[tex]\frac{x+y}{2}[/tex] = 5 ( multiply both sides by 2 ) ← AM

x + y = 10 → (1)

[tex]\sqrt{xy}[/tex] = 4 ( square both sides ) ← GM

xy = 16 → (2)

From (1) , expressing x in terms of y

x = 10 - y ← substitute into (2)

(10 - y)y = 16

10y - y² = 16 ( subtract 16 from both sides )

10y - y² - 16 = 0 ( multiply through by - 1 )

y² - 10y + 16 = 0 ← in standard form

(y - 2)(y - 8) = 0 ← in factored form

Equate each factor to zero and solve for y

y - 2 = 0 ⇒ y = 2

y - 8 = 0 ⇒ y = 8

Substitute into (1)

x + 2 = 10 ⇒ x = 8 or x + 8 = 10 ⇒ x = 2

The 2 numbers are 2 and 8

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subtract 7x+3y-5z from 8x-3y+5z i'm the worst at math someone help Fill in the blank with the correct form of SER or ESTAR or TENERDO NOT USE ACCENTS!!Nosotros____ una prueba de historia. you light me up inside, like the fourth of july? What is five multiplied by one tenth plus seven multiplied by one hundredth plus three multiplied by one thousandth written in standard form? HELP I Will give brainleist Which part of the purchasing process includes the sum of money due inpayment for the goods?A. InvoiceB. PaymentC. RequisitionD. ShippingANSWER: A. Invoice PLEASE HELP!!!!!!!( Calculate the value of the expression ) Help!!!!!!!!!!!! Multiple choice !! Convert 6.5 cm3 to m3 HELP! EASY! Fill in the blanks! Please help! Greatly appreciated. Thank you! two step equation 7x - 24 = 25 i really need help with this Hello may anyone help me with this? youd be such a life saver :) Find the equation of the line that is parallel to y = 4 - 3x and passes through thepoint (1,5). How u solve these I dont get it :h Q. Change the voice in the following sentences: The grandmother fed the dogs every day. The sparrows havent eaten the crumbs. The people of Egypt love the pharaoh. Sue showed bravery in a crisis. Teaching of moral values increases the value of schooling. Aram was not riding the horse in the beginning. Taplow is waiting for Mr. Crocker Harris. Virginia had helped the ghost. The shopkeeper didnt give me the bill of purchase. Ratna hadnt noticed Ranga. Translate this phrase into an algebraic expression. 23 increased by twice Vidya's savingsUse the variable to represent Vidya's savings. Does the expression 30 + (-23) represent the temperature at night? help please! Which number has both 3 and 5 as factors? O 1215 O 1332 O 1135 O 1403 what is History ? Your opinion that explains what history is to you.