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Yogita Ingle 5 years, 7 months ago

n/5+3=-7/2

n/5 = -7/2 - 3
n/5 = (-7 - 6)/2

n/5 = -13/2
2n = - 65
n = -65/2

3Thank You

ANSWER

Fifteen years from now revi's age will be four times his oresent age.What is revi's present age?

Posted by Muhammed Saffan . A 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 7 months ago

From the given, Let Ravi’s present age is taken as "a" years.

After 15 years, his age = (a+15) years.

By the given, it is identified that the age of Ravi after 15 years is equal to the 4 times of his present age.

Given,
a + 15 = 4a
4a - a = 15
3a = 15

a = 15/3
a= 5

Then, it has been found that the present age of Ravi is 5 when his age after 15 years will be 4 times of his present age.

ANSWER

Find a if a^4 = 3/13^-2÷3/13^-14

Posted by Sadhana Swathi 5 years, 7 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

A tree sheds 15%9f its leaves in a week and 10% of the remaining leaves in the next week.What percentage of the original number of leaves are on the tree then? A.75% B.23.50% C.76.50% D.74.50%

Posted by Shreyas Patil 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Vansh Raheja 5 years, 7 months ago

76.5%

ANSWER

3x/4-2x+5/3 =5/2

Posted by Rajesh Palathitta 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 7 months ago

3x/4 - 2x + 5/3 = 5/2

3x /4 - 2x = 5/2 - 5/3
(3x - 8x)/4 = (15 - 10)/6
-5x/4 = 5/6

- 30x = 20

x = -20/30

x = -2/3

4Thank You

ANSWER

Prove that in a parallelogram diagonals bisect each other

Posted by Sowjanya Lekisha 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 7 months ago

Given : ||gm ABCD in which diagonals AC and BD bisect each other.
To Prove : OA = OC and OB = OD
Proof : AB || CD (Given)
∠1 = ∠2 (alternate ∠s)
∠3 = ∠4 = (alternate ∠s)
and AB = CD (opposite sides of //gm)
∆COD = ∆AOB (A.S.A. rule)
OA = OC and OB = OD
Hence the result.

3Thank You

ANSWER

15x²+14x+28 by 3x+4

Posted by Tarunakumar Dalai 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Priyal Raj 5 years, 7 months ago

Here by is multiplication or division

ANSWER

Find the square root of the following number by division met • 3481 •9216 • 10201

Posted by Suravi Roy 5 years, 7 months ago

CBSE > Class 08 > Mathematics

2 answers

Aditi Mondkar 5 years, 7 months ago

3481=59 9216=96 10201=101

Alka Dhabale 5 years, 7 months ago

3481=56

ANSWER

Verify that -(-x)=x for: (i) x= 11/15 (ii) x= -13/17

Posted by Namita Biju Nair 5 years, 7 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

9 power 8 multiplied to x power 2 to the whole power 5 divided by 27 to the whole power 4 multiplied to x power 2 to the whole power 3

Posted by Vaishnavraj.N 8 'C' 1 0 7 8 5 5 years, 7 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

If -3 by 8 x = 15 by 32 then x is equal to :

Posted by Vaibhav Anil 5 years, 7 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

range kese nikale iska -11,13,14,16,9,17,18,12

Posted by Bhole Kaa Deewana 5 years, 7 months ago

CBSE > Class 08 > Mathematics

3 answers

Piyush Kumar Kumar 5 years, 7 months ago

sabse chota number ko sabse bada number se subtract kar do e.x= 9-18 -9

Gaurav Seth 5 years, 7 months ago

The Range is the difference between the lowest and highest values.

Example: In {4, 6, 9, 3, 7} the lowest value is 3, and the highest is 9.

So the range is 9 − 3 = 6.

In the given sum the highest number is 18 and the lowest number is is 9

Hence Range = highest minus lowest

= 18 - 9

= 9

Yogita Ingle 5 years, 7 months ago

Highest value = 18
Least value = 9
Range = Highest value - Least value

= 18 - 9

Range = 9

ANSWER

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Posted by V Adithya 5 years, 7 months ago

CBSE > Class 08 > Mathematics

5 answers

V Adithya 5 years, 7 months ago

PLEASE PLEASE SEND ME

V Adithya 5 years, 7 months ago

Send me

Yahiah Rahman 5 years, 7 months ago

Ok, done

V Adithya 5 years, 7 months ago

Do you have

Kesar ?? 5 years, 7 months ago

But how

5Thank You

ANSWER

Ones place digit of a two digit number is twice of the digit at tens place. If the new number obtained by reversing the digits of the number is greater by 18 than the number. Find the original two digit number.

Posted by Masum Patel 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Sajal Choudhary 5 years, 7 months ago

The answer is Let the two digits no. Be xy Then twice the tens digit number Like y=2x Then it makes 10x ➕ 2x =12x Then it will be reverse Yx =10y ➕ x =20x ➕ x =21 12x ➕ 21x =18 33x=18 X = 18 /33 Okkk

ANSWER

Which app is best for Hindi bharat ki khoj questions answered ?

Posted by Sakhavala Dhrumil Shailebhai 5 years, 7 months ago

CBSE > Class 08 > Mathematics

3 answers

Aditi Mondkar 5 years, 7 months ago

Ncert solutionhttps://play.google.com/store/apps/details?id=com.ncert

Anu Dobwal 5 years, 7 months ago

Ncert solutions

Archita Baghla 5 years, 7 months ago

Dont knoe

ANSWER

The area of a rectangle is 1 hectare if the ratio of length and breadth be 3:2 find diagonal and sides

Posted by Subhashree Mohanta 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Sajal Choudhary 5 years, 7 months ago

Answer 4.6/5 85 Zenishtha Expert 157 answers 12.3K people helped Let the sides be 1k and 3k. Given, area = 3/4 hectares = m^{2} = 7500 m^{2} L*B= 7500 1k*3k= 7500 3k^{2}=7500 k^{2}=2500 k= 50. Therefore, l= 3*50= 150m b=1*50=50m Perimeter= 2(l+b) = 2(150+50) = 2 (200) = 400m

ANSWER

The ages of Rahul and haroon are in the ratio 5:7 four years later the sum of their ages will be 56 years. What are their present ages

Posted by Vaishnavi Padshetty ....... 5 years, 7 months ago

CBSE > Class 08 > Mathematics

2 answers

Vaishnavi Padshetty ....... 5 years, 5 months ago

Give two examples of each. (A) kharif crop (B) rabi crop

Ashwin Nair 5 years, 5 months ago

Let the common multiple be x So, Rahul =5x Haroon=7x After 4 years, Rahul =5x+4 Haroon =7x+4 According to the question, (5x+4)+(7x+4)=56 5x+4+7x+4=56(opening bracket) 5x+7x+4+4=56(grouping) 12x +8= 56 12x=56-8(transposing 8 to RHS) 12x=48 X=48/12(transposing 12 to RHS) X=4 Rahul =5x=5×4=20 Haroon=7x=7×4=28

4Thank You

ANSWER

You are told that 1,331 is a perfect cube. Can you guess without factorization what is its cube root? Similarly guess the cube roots of 4913, 12167, 32768.

Posted by Rishik Singh 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Alka Dhabale 5 years, 7 months ago

1331=11,4913=17,12167=23,32768=32

ANSWER

After the update ,I didn't get the online test

Posted by Megha Santhosh 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Aryan Sharma 5 years, 7 months ago

So what can we do

ANSWER

3t-2/3+2t+3/2=t+7/6

Posted by Swati Shinde 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Sajal Choudhary 5 years, 7 months ago

Your question 3t-2/3 + 2t + 3/2 =t + 7/6 This is your answer Lcm of 3 and 2 is 6 2(3t-2) + 3 (2t + 3)/ 6 6t-4 + 6t+ 9/6=t + 7 /6 12t-5 /6 = t + 7/6 Then 6 will be cut because both side has divided by 6 It will be becames 12t-5 = t + 7 12t -t = 7 + 5 11t = 12 T=12/11 This is your answer

ANSWER

8x±7=10

Posted by Rajesh Palathitta 5 years, 7 months ago

CBSE > Class 08 > Mathematics

5 answers

Anu Dobwal 5 years, 7 months ago

x = 3/8

Sajal Choudhary 5 years, 7 months ago

This is your answer 8x +7=10 8x = 10-7 8x =3 X = 3/8 This is your answer

Rishik Singh 5 years, 7 months ago

8X =10-7 8X=3 X=3/8

Roopa Y 5 years, 7 months ago

8x = 10-7 8x = 3 x = 3/8

Renvil Vian 5 years, 7 months ago

8x + 7= 10 8x = 10-7 8x = 3 x = 3/8 x. = 0.375

3Thank You

ANSWER

3n + 5=20

Posted by Anande Anande 5 years, 7 months ago

CBSE > Class 08 > Mathematics

5 answers

Mannat Sachdeva 5 years, 7 months ago

3n +5 =20 3n = 20-5 3n = 15 n = 15/3 n = 5

Naman Ahden 5 years, 7 months ago

n = 20-5/3 15/3 5

Vaishnavi Tyagi 5 years, 7 months ago

3n + 5=20 3n =20 - 5 3n= 15 n= 15/3 n = 5

Rajesh Palathitta 5 years, 7 months ago

3n=20-5=15 n=15/3= 5

Yogita Ingle 5 years, 7 months ago

3n + 5=20

3n = 20 - 5

3n = 15

n = 15/3

n = 5

ANSWER

Find the cube root of 5832 , 262144 , 12167 and 50653 by observation.

Posted by Santosh Dwivedi 5 years, 7 months ago

CBSE > Class 08 > Mathematics

3 answers

Santosh Dwivedi 5 years, 7 months ago

Why we multiply 3 and 2 twice

Gaurav Seth 5 years, 7 months ago

1. 5832=3×3×3×3×3×3×2×2×2
=3×3×2
=18

2. 262144

The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2

= 2 x 2 x 2 x 2 x 2 x 2

= 64

Santosh Dwivedi 5 years, 7 months ago

ANSWER

-2/5×3/7+3/10-3/5×1/7

Posted by Vani Bhatia 5 years, 7 months ago

CBSE > Class 08 > Mathematics

2 answers

Lucky Somra 5 years, 7 months ago

Questions.-2/5×3/7+3/10-3/5×1/7 Sol.-6/5+3/10-3/35 -12+21-6/70=39/70answer

Yogita Ingle 5 years, 7 months ago

-2/5×3/7+3/10-3/5×1/7

= -15/35 + 3/10 + 3/35

= (-30 + 21 + 6)/70
= -3/70

ANSWER

(3p-2)-5(6p-1)=2(p-8)-6(7p-4)

Posted by Hameera Sadaf 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 7 months ago

(3p-2)-5(6p-1)=2(p-8)-6(7p-4)

3p - 2 - 5(6p) - 5 (-1) = 2p - 2 (8) - 6(7p) - 6 (-4)
3p - 2 - 30p + 5 = 2p - 16 - 42p + 24
-27p + 3 = -40p +8
-27p + 40p = 8 - 3
13p = 5

p = 5/13

ANSWER

110592 prime factorisation method

Posted by Kaushik Agarwal 5 years, 7 months ago

CBSE > Class 08 > Mathematics

2 answers

Yogita Ingle 5 years, 7 months ago

Prime Factors of 110592 =2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3

Which is the same as = 212 x 33

Prime Factors Tree of 110592

110592 <div>/     \
2    <a href="https://www.2dtx.com/prime/prime55296.html">55296 </a></div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime27648.html">27648 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime13824.html">13824 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime6912.html">6912 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime3456.html">3456 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime1728.html">1728 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime864.html">864 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime432.html">432 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime216.html">216 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime108.html">108 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime54.html">54 </a></div> </div> <div> <div>/       \
2      <a href="https://www.2dtx.com/prime/prime27.html">27 </a></div> </div> <div> <div>/       \
3      <a href="https://www.2dtx.com/prime/prime9.html">9 </a></div> </div> <div> <div>/       \
3      <a href="https://www.2dtx.com/prime/prime3.html">3 </a></div> </div> <div> <div>/       \
3      <a href="https://www.2dtx.com/prime/prime1.html">1 </a></div> </div>

Kaushik Agarwal 5 years, 7 months ago

ANSWER

Find the phythagorean triplet of A.6 B.14

Posted by Nishant Dahiya 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 7 months ago

Pythagorean triplets:

For any natural number m > 1, we have (2m) ² + (m2 – 1)²= (m2 + 1)² . So, 2m, m² – 1 and m² + 1 forms a Pythagorean triplet.

I) Let 2m = 6
m = 3

m²+ 1 = 3² + 1= 9 + 1 = 10

m²- 1 = 3 ²- 1 = 9 - 1 = 8

check:

6 ² + 8² = 36 + 64 = 100 = 10²

Hence, the triplet is 6, 8 & 10

ii)

Let 2 m = 14

m = 7

m² + 1 = 7²+ 1 = 49 + 1 = 50

m²- 1 = 7² - 1 = 49 - 1 = 48

check:

14² + 48² = 196 + 1304 = 2500 = 50²

Hence, the triplet is 14, 48, and 50

ANSWER

Find the number of sides of a polygon which has 20 diagonal

Posted by Nilkamal Ahima 5 years, 7 months ago

CBSE > Class 08 > Mathematics

1 answers

Gaurav Seth 5 years, 7 months ago

Consider a polygon with n vertices. Each vertex can be connected to the n-1 other vertices but two of those connections (to the two adjacent vertices) form sides of the polygon, not diagonals. So there are n-3 diagonals emanating from each of the n vertices giving n(n-3) diagonals. This formula overcounts because it counts each diagonal twice: once for each vertex on the diagonal. Divide by two to compensate for the overcounting giving n(n-3)/2 diagonals.

You can set n(n-3)/2 = 20, expand and solve the quadratic equation by factorization but this is time consuming and inefficient. Way faster is to simply plug in the answer choices for n and see which one satisfies the equation: n(n-3) = 40. Ans: n=8.

20=(n^2-3n)/2

40=n^2-3n
n^2-3n-40= 0
Splitting the middle term,

n^2-8n+5n-40=0
n(n-8)+5(n-8)=0
(n-8)(n+5)= 0

So there are two values for n
n-8=0 or n+5=0
n = 8 or n = -5
n can’t be negative
So n = 8

ANSWER

What is the square root of 3 correct it to three decimal places

Posted by Adarsh Dubey 5 years, 7 months ago

CBSE > Class 08 > Mathematics

2 answers

Guratan Kaur 5 years, 7 months ago

Thanks

Yogita Ingle 5 years, 7 months ago

Value of root 3, √3 =1.732
Since 3 is a non-perfect square number, we will find the value of root 3 using long division method as follows

ANSWER

Multiply (-5a²b²)by(-6ab)

Posted by Harini Poornima 5 years, 7 months ago

CBSE > Class 08 > Mathematics

3 answers

Vansh Shekhawat 5 years, 7 months ago

Thanks

Sonal Ramteke 5 years, 7 months ago

given algebraic expression are : 4a² + 5b² + 6ab , 3ab , 6a² - 2b² , 4b² - 5ab; now adding all expressions ;[horizontal method ] = (4a² + 5b² + 6ab) + 3ab + ( 6a² - 2b² ) + (4b² - 5ab) = (4a² + 6a² ) + (5b² - 2b² + 4b² ) + (6ab + 3ab - 5ab) = 10a² + 7b² + 4ab add all expressions [vertical method ] 4a² + 5b² + 6ab + 3ab +6a² - 2b² + 4b² - 5ab --------------------------------------------------------- 10a² + 7b² + 4ab yeah, we get the same answer with both methods

Yogita Ingle 5 years, 7 months ago

Multiply (-5a²b²)by(-6ab) = (-5a²b²) × (-6ab)

= 30a³b³