ind all natural numbers n such that 1+3+5+7+...+(2n-1) sum is divisible by 4

Answers

Answer 1

Answer:

All even natural numbers

Step-by-step explanation:

This is an AP with:

The first term = 1Number of terms = nCommon difference = 2

Find the sum of the first n terms:

[tex]S_n= n(1+2n-1)/2=n^2[/tex]

The sum is divisible by 4 if n is even number:

n = 2k ⇒ n² = 4k² ≡ 0 mod 4

Related Questions

How many different 9-letter "words" can you
make by arranging the letters in DEVIATION?
The arrangements don't have to be actual words
that are included in any dictionary.

Answers

There are 5040 different 9-letter “words” that can be made by arranging the letters in DEVIATION.

The given word is DEVIATION and we are required to find out the number of different 9-letter “words” that can be formed by arranging its letters.

To solve the problem, we will use the formula for finding permutations of n objects taken r at a time when all the objects are distinct.

The formula is given by: nPr = n! / (n-r)! where n is the total number of objects and r is the number of objects to be selected.

Here, we have 9 objects (letters) and we need to arrange all of them, so r = 9.

Now, we need to find out the value of n.

The given word DEVIATION has 9 letters, but two of them (E and I) are repeated twice.

Therefore, n = 9 - 2 = 7.

We will substitute these values in the formula to get the required answer:

nPr = n! / (n-r)! = 7! / (7-9)! = 7! / (-2)! = 7! / 1 = 5040

Therefore, there are 5040 different 9-letter “words” that can be made by arranging the letters in DEVIATION.

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Pls answer ASAP this is timed and don’t put a link

Answers

Answer:

C: mean 6.5 median 6

Step-by-step explanation:

median you find middle number in sorted numbers lined up. mean is all numbers added up and divided by how many there are

Find the value of the expression 2x2 - 4x2 + 7x – 7 if x= 3. What is the value if x = 2?

Answers

Answer:

if x= 3, so it's 32  if x= 2, so it's 7

Step-by-step explanation:

Help me solve this ASAP please

Answers

X= - 1836/13

Step 1 -Multiply both sides of the equation by 18
Step 2 - Collect like terms
Step 3 - Swap the sides of the equation
Step 4 - Divide both sides of the equation by 13

Problem 2: A ball is dropped from rest from a height of 6 meters, Find the time it takes the ball
to fall. Find the velocity of the ball just before it hits the earth. Assume no air resistance and
that acceleration due to gravity (g) is 9.8 m/s/s.

Answers

Answer:

1.11 s , 10.88 m/s

Step-by-step explanation:

Initial velocity and air resistance = 0

Time to fall : s = 1/2 gt²

6 = 1/2 * 9.8 * t²

t² = 1.224

t = 1.11 s

final velocity = initial velocity + gt

                    = 0 + 9.8 * 1.11

                    = 10.88 m/s

If a car top speed is 180km/h how far will it go in 3 hours

Answers

It will go 60km/h !!!!:)

Samuel wants to ride his bicycle 32.4 miles this week. He has already ridden 18 miles.
If he rides for 4 more days, write and solve an equation which can be used to
determine 2, the average number of miles he would have to ride each day to meet his
goal.
Equation:
Answer: 2=
Submit Answer

Answers

Answer:

equation: 4x + 18 = 32.4

answer: x = 3.6

Step-by-step explanation:

Please help with this math problem

Draw a figure and then solve

Answers

Answer:

x=180-a/2+a/2

m AEP =90

The table gives selected values of the function y=ax^3 + bx^2 +cx + d. What is a+d?
x -2 -1 0 1 2 3
y 36 0 -6 0 0 -24

Answers

Answer:

What is the volume of a sphere with a radius of 24 units? A. 92167 units O B, 230477 unite 3 O c. 18A324 units D. 13,8247 units

Step-by-step explanation:

Answer:

x=6

Step-by-step explanation:

point Find the length of segment CD with C(2,3) and D (-3, 15​

Answers

Step-by-step explanation:

so, if the text is correct, the 2 points are

(2, 3) and (-3, 15).

the length of the line segment is the distance between both points.

did this we use Pythagoras for right-angled triangles.

c² = a² + b²

c is the Hypotenuse and the distance between both points. a and b are the legs (enclosing the 90 degree angle), which are simply the differences of the x and the y coordinates.

so,

distance² = (2 - -3)² + (3 - 15)² = 5² + (-12)² = 25 + 144 = 169

distance = sqrt(169) = 13 = length of line segment

If you borrow $3,500 at 4% simple interest for 3 years. How much money do you have

to pay

Answers

Answer:

Hii, I believe your answer would be $3,360

Hope this helps!

Step-by-step explanation:

How many 4-digit natural numbers are there?

Answers

Answer:

9000

4-digit numbers..

The wrong answer is 489100499 or 029

If -13(q+4) is equal to 7q+16 what’s is q

Answers

Answer:

q = - 3.4

Step-by-step explanation:

- 13(q + 4) = 7q + 16 ← distribute parenthesis on left side

- 13q - 52 = 7q + 16 ( subtract 7q from both sides )

- 20q - 52 = 16 ( add 52 to both sides )

- 20q = 68 ( divide both sides by - 20 )

q = - 3.4

Please Answer!! Will give Brainliest

Answers

Answer:

2

Step-by-step explanation:

EZ, I am in 7th, and I did coordinate plane, it so ez, anyways hope that hels


1) Hot dogs are sold in packs of 10 and hot dog buns are sold in packs of 8. Tommy wants
to know the least number of packs of hot dogs and buns he needs to buy so that he does not
have any left over.
) Complete the table.

Answers

Answer:

10, 20,30, 40, 50

Step-by-step explanation:

You times them all by 10 for example: 1x10=10 2x10=20 3x10= 30 4x10=40 and 5x10=50.

If we buy four packs of hot dogs and five packs of buns then we don't have any left over.

What is Least common multiple?

The abbreviation LCM stands for "Least Common Multiple." The smallest multiple that two or more numbers share is known as the least common multiple.

For example: Take two integers, 2 and 3.

Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20….

Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 ….

Therefore, 6 is the least common multiple of 2 and 3.

Given:

Packs          1       2     3      4       5

Hot Dogs   10     20   30   40    50

Bun             8      16     24   32    40

Also, LCM(10, 8)

10= 2 x 5

8= 2 x 2 x 2

So, LCM(10, 8)= 2 x 2 x 2 x 5 = 40

Hence, If we buy four packs of hot dogs and five packs of buns then we don't have any left over.

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At a super market broccoli and celery are sold at $0.59 per 100 g and $0.26 pee 100g.how much do 1.2 kg of broccoli and 950 g of celery costs

Answers

1.2 kg of broccoli costs $7.08.

950 g of celery costs $2.47.

In order to determine the cost of 1.2 kg of broccoli, the first step is to determine the cost of 1kg of broccoli

1 kg = 1000 g

100g = 0.1 kg

Cost of one kg of broccoli = $0.59 / 0.1 = $5.90

The second step is to determine the cost of 1.2kg of broccoli.

$5.9 x 1.2 = $7.08

In order to determine the cost of 950g of celery, the cost of 1g of celery.

$0.26 / 100 = $0.0026

The second step is to determine the cost of 950g of celery.

950 x 0.0026 = $2.47

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This question is really bothering me: A restaurant has a square floor with an area of 324 m². Sketch the resaurant floor. What are its dimensions?

Answers

324= 18m

I am positive 18m is the correct answer, sorry if I am wrong. Make sure to check before submitting

The required dimensions of the restaurant is 18 by 18 meters.

Given that,

This question is really bothering me: A restaurant has a square floor with an area of 324 m². Sketch the restaurant floor. dimensions are to be evaluated.

What is surface area?

Surface area is defined as the collective region, whose mathematical expression can be formed.

here,

Let the sides of the square restaurant be a,
The area of the restaurant =  area of the square
324 = a²
a = √324
a = 18 meters,

Thus, the required dimensions of the restaurant are 18 by 18 meters.

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Evaluate the function

Answers

(3*2)^2-(2*2)+5
36-4+5
=37

Which arrangement shows264, 6.45, 625, and508 in order from least to greatest?



A. 508, 625,264, 6.45


B. 508, 625, 6.45, 264


C. 264, 508, 625, 6.45


D. 625, 508, 6.45, 264

PLZ help I really need answer ill make you brainliest

Answers

Answer:

C.264,508,625,645

Step-by-step explanation:

the arrangement is from the least number to the greatest

what law would you use to simplify (2xy)^(2)

Answers

Answer:

(2xy)²

Step-by-step explanation:

please mark me as brainliest


Evaluate
Write your answer as a fraction in simplest form.
HELP PLEASE

Answers

Answer

-3⁻³/6⁻²

= (-1*3)⁻³/(2*3)⁻²

= -1⁻³·3⁻³/2⁻²·3⁻²

= -1.3⁻³⁺²/2⁻²

= -1.3⁻¹/2⁻²

= -4/3

Step-by-step explanation:

Influenced or Limited or Both?
1. The gene is located in the autosomes
2. Expression of the gene is only in one sex
3. Expression of the gene is mostly observed in one sex.
4. Trait act as recessive in one sex and dominant in another sex.
5. Traits can be passed on to the next generation even without expressing the trait.​

Answers

1.Limited
2. Both
3.Limited
4.Influenced
5.Influenced

PLZZ HELP ME i really need help​

Answers

Answer:

1

Step-by-step explanation:

the function is y=x+1

The answer is to the problem is y=x+1

Hi can u plz help me

Answers

Answer:

7 / 6

Step-by-step explanation:

( 2x + 6 ) / 5 = 4x - 3

2x + 6 = 5 ( 4x - 3 )

2x + 6 = 20x - 15

20x - 15 = 2x + 6

20x - 2x = 6 + 15

18x = 21

x = 21 / 18

21 = 7 * 3

18 = 6 * 3

x = 21 / 18

  = ( 7 * 3 ) / ( 6 * 3 )

x = 7 / 6

Hence proved.

Please help! I'll mark Brainliest.

I just need to know what G and F are! Or how to find them? I'm being timed!

Answers

Answer:

G and F are the lines I guess? You have to use them to answer the rest of the questions.

Use the distributive property to write an equivalent expression 2(r+8) 2(r+8)

Answers

Answer:

Simplified expression: (2r+16)(2r+16)

if you need to combine like terms it would be 4r+32

Step-by-step explanation:

to distribute you multiply whatever is outside the parenthesis with everythign inside. 2*r= 2r, 2*8= 16

(2r+16)(2r+16)

and if you want to combine like terms it would be

4r+32

since you add whatever goes together (whole numbers +whole numbers, numbers with variable+ numbers with variable)

Answer clearly !!
Find the area

Answers

For height of garden we can use Phytagoreaan Theorem :

h² = 25² - 7²

h² = 625 - 49

h² = 576

h = 16 m

Area

= 1/2 × base × height

= 1/2 × 14 m × 16 m

= 7 m × 16 m

= 112 m²

A lobster weight 42 1/5kg A crab weight 41/5kg less than lobster what is their combined weight​

Answers

Crab Weight

= 42 1/5 - 41/5

= 211/5 - 41/5

= 170/5

Combined weight

= 170/5 + 211/5

= 381/5

= 76 1/5

#LearnWithEXO

Simplify the following:

1)y^6/y^2
2)b^7/b^5

Answers

Answer:

look at the photo i have sent

George visits a store to buy 2 flash drives. They are priced at $28 each. How much does he need to spend on his purchase?

Answers

If George needs to buy 2 flash drives and they are $28 each then he needs to spend a total of $56 on his purchase.

$28x2=$56
or
$28+$28=$56
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