CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

Here, a = 7
a₁₃ = 35
a_n= a + (n - 1)d
{tex} \Rightarrow {/tex} a₁₃ = a + (13 - 1)d
{tex} \Rightarrow {/tex} a₁₃ = a + 12d
{tex} \Rightarrow {/tex} 35 = 7 + 12d
{tex} \Rightarrow {/tex} 12d = 35 - 7
{tex} \Rightarrow {/tex} 12d = 28
{tex} \Rightarrow d = \frac{{28}}{{12}}{/tex}
{tex} \Rightarrow d = \frac{7}{3}{/tex}
Again, we know that
{tex}{S_n} = \frac{n}{2}\left[ {2a + (n - 1)d} \right]{/tex}
{tex} \Rightarrow {S_{13}} = \frac{{13}}{2}\left[ {2a + (13 - 1)d} \right]{/tex}
{tex} \Rightarrow {S_{13}} = \frac{{13}}{2}\left[ {2a + 12d} \right]{/tex}
{tex}={S_{13}} = \frac{{13}}{2}\left[ {2(7) + 12\left( {\frac{7}{3}} \right)} \right]{/tex}
{tex} \Rightarrow {S_{13}} = \frac{{13}}{2}(14 + 28){/tex}
{tex} \Rightarrow {S_{13}} = \frac{{13}}{2}(42){/tex}
{tex} \Rightarrow {S_{13}} = (13)(21){/tex}
{tex} \Rightarrow {S_{13}} = 273{/tex}

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I cannot understand age type question

Posted by Nikhil Kumar 7 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Aashu Singh 7 years, 7 months ago

Its too simple all u have to do is to read the question with great conserdation

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Anu Shree 7 years, 7 months ago

U should work hard

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A is elder to B by 2 years. A's father Fis twice as old as Aand Bis twice as old as his sister S.if the ages of the father and sister differ by 40 years,find the age of A.

Posted by Sk Harsh 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Lipsa Rani 7 years, 7 months ago

Let the age of B is x,then the age of Ais x+2,A's father age is 2x+4,B's sister age is x÷2,so,2x+4-x÷2=40,4x+8-x=80,3x+8=80,3x=72,x=72÷3,x=24,so the age of B=24 and the age of A is 24+2=26

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Find the zeroes of the polynomial x³-3x²-2x+6

Posted by Divya Mittal 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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If [x+1] is a factor of 2x^3+ax^2+2bx+1 then find the value of a and b and given that 2a- 3b=4

Posted by Om Singh 7 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Rahul Kumar 7 years, 7 months ago

You can also find the answer by factor theriwm

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..... ...... 7 years, 7 months ago

Put -1 in the polynomial p(x) , you will get another equation then solve it

1Thank You

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Under root of 2

Posted by Krishna Sharma 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

..... ...... 7 years, 7 months ago

1.414

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Express the square of any positive integer in 3m,3m+1,3m+2

Posted by Animish Kawade 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Varsha Vishnoi 7 years, 7 months ago

search this in chrome you'll get answer

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Prove that -3+7=6

Posted by Vijay Raju 7 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Aashu Singh 7 years, 7 months ago

Is this possible or not ????????

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Varsha Vishnoi 7 years, 7 months ago

I can't cool one

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Ex. 3.1 ka qs. No. Second kaise bne GA

Posted by Sakshi Gupta 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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find the number of points on x-axis which are at a distance of 2 units from (2,4).

Posted by Md Ilyaan 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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2^(x)-2^(x-1)=4

Posted by Atikantvishesh Singh 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Dhairya Varshney 7 years, 7 months ago

X=3

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Question 5 ex_2.4

Posted by Harshit Rawat 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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Marking system of 10th cbse 2019

Posted by Abhishek Reddy 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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Find value of k for which of the following systems of equations have infinite solutions 1)x+(k+1)y=4;(k+1)x+9y=5k+2

Posted by Avantika Sakhuja 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Krishna Kshirsagar 7 years, 7 months ago

x+ky+y-4=0 ---------------------------- > equation 1 x+9y-5k-2=0 ----------------------------> equation 2 compare equation 1 and 2 x+ky+y-4=x+9y-5k-2 -2+ky=8y-5k

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If 2p,p+10,3p+2 are in A.P then find the value of p

Posted by Bhuvan Bhuvan 7 years, 7 months ago

CBSE > Class 10 > Mathematics

4 answers

Jasmine Panchal 4 years, 4 months ago

a2+a2=a3+a1 2a2=a3+a1 putting the values 2(p+10)=3p+2+2p 2p+20=5p+2 2p-5p=2-20 -3p= -18 p=-18/ -3 here minus cuts minus so we are left with 18/3 =6 therefore p=6

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Bijayalaxmi Rath 5 years ago

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Bijayalaxmi Rath 5 years ago

jvjjv

1Thank You

Kashish Kalra 7 years, 7 months ago

2p+p+10=3p+10 =P+10+3p+2= 4p+12 =3p-4p=12-10 =-p=2 =p=-2

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All circles are .( Congruent, similar)

Posted by Sukrojay Chakma 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Dhairya Varshney 7 years, 7 months ago

Similar

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why π is said an irrational number while it can be written as 22/7 ?

Posted by Failaw Brahma 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Kritisha 04 7 years, 7 months ago

When we divide 22 by 7 the decimal ans would be non recurring and non terminating

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Pl mmnn

Posted by Manish Gupta 7 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Khyati Mahida 7 years, 7 months ago

Sorry 2016-18's bach

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Khyati Mahida 7 years, 7 months ago

What do you want to ask ??

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Laplas law

Posted by Ritik Shrivastav 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Ritik Shrivastav 7 years, 7 months ago

2or2

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if cos 9a =sina and 9a <90' , then find the value of tan5a is

Posted by Prem Parkash 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Lipsa Rani 7 years, 7 months ago

Cos 9a =sin a,sin (90-9a)=sina,90-9a=a,90=10a,a=9 so,tan 5×9=tan 45=1

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Find zeros of the quadratic polynomial x²+88x+125

Posted by Pallavi Jha 7 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Mrityunjay Kr 5 years, 8 months ago

1Thank You

ANSWER

Explain theorem 1.3

Posted by Lipsa Rani 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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Suppose in the exam the question like 3root 2 prove it irrational will come then in the last will we write root2 is irrational after proving it there or directly will we write it is irrational

Posted by Lipsa Rani 7 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

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Find the zeros of the polynomial and verify the relationship between the zeroes of the coffecints 25x²-x

Posted by Divya Mittal 7 years, 7 months ago

CBSE > Class 10 > Mathematics

3 answers

Divyanshu Mehta 7 years, 7 months ago

(25x²-X) X(25x-1) Its factors are:- X=0/1 and x=1/25 Verification:- Sum=coeffecient of x/coeffecient of x² 0/1+1/25=1/25 0+1/25=1/25 1/25=1/25 Lhs= rhs

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Tarun Rana 7 years, 7 months ago

Solution of this question not answer

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Tarun Rana 7 years, 7 months ago

I Know the solution of this answer but I can't tell you on this aap

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2x+y=o

Posted by Roshan Singh Jalal 7 years, 7 months ago

CBSE > Class 10 > Mathematics