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

a+3d=0 (eq..1) given, a=-3d.(eq 2) Now , A+24d=3(a+10d) to prove.. Substitute value of a, -3d+24d=-9d+30 , 21d=21d .. Therefore proved.. NOT SURE SO PLEASE ANY TEACHER CHECK MY WAY.

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Last Bencher 6 years, 10 months ago

Anusree r u a malayali

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Anusree Unnikrishnan 6 years, 10 months ago

it has been given that a4=0 => a+3d=0 => a= -3d ------- (1) a11= a+10d = -3d+10d = 7d [ from (1)] a25 = a+24d = -3d+24d = 21d [ from (1)] therefore, comparing 7d and 21d we get, 21d = 3 ( 7d ) i.e. a25 = 3(a11) Hence, proved. Hope it helps.

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In figure, there is a chord AB of a circle with center O that subtents an angle of 90 find the area of minor segment and area of major segment

Posted by Hrishika Bishnoi 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Devil ? 6 years, 10 months ago

Radius ?????

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Mishthi ? 6 years, 10 months ago

No figure...

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X^ 2 +2x + k is a factor of 2x^4+ x- 14x^2 5x 6

Posted by Harsi Annur 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Sushant Chaubey 6 years, 10 months ago

Your question is not clear .... Please write it clearly....??

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Important theorem class9 for exam

Posted by Harpreetsingh Singh 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Mishthi ? 6 years, 10 months ago

Y 10th h mr.harpreetsingh....??

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a/p(q-r)+b/q(r-p)+c/r(p-q)

Posted by Raj Khan 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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If sinA+2cosA=√3 Then find the value of 4tan^2A+cot^2A

Posted by Garv Bhatia 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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How can we do mid term splitting of 5xsquare+7x+1

Posted by Sanjay Jaiswal 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Mahak Garg 6 years, 10 months ago

We have to use in this formula method . Their is no use of mid term splitting in this equation

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Is the answer of sec a+tan a=p ; the value of cosec a can be 1+p Square /1-p Square

Posted by Pardeep Kaur Cheema 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Kirti Dhillon 6 years, 10 months ago

How you send image

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Affu 😊 6 years, 10 months ago

How to send image ????

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If 21th term of an ap is 25 then find the sum of first 41 terms ?

Posted by Kirti Dhillon 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 6 years, 10 months ago

a_n = a+ ( n -1)d
a21 = 25
a + 20d = 25
a = 25 - 20d
Sn = n/2 [2a + l]
S₄₁=(41/2)[2(25-20d)+(40d)]
=(41/2)[50-40d+40d]
=50(41/2)
=1025

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Mishthi ? 6 years, 10 months ago

1025..

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If 4tan theta = 3 evaluate (4sin theta-cos theta+1÷4sin theta +cos theta -1)

Posted by Pratha Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Ram Kushwah 6 years, 10 months ago

LET x=theta

tanx=3/4

sec² x=(1+tan²x)=(1+9/16)=25/16

sec x=5/4 ,cos x =4/5

sin²x=(1-16/25)=9/25 so sinx=3/5

Now (4sinx -cos x+1)/(4sinx+cosx-1)

=(4*3/5-4/5+1)/(4*3/5+4/5-1)

=(12/5-4/5+5/5)/(12/5+4/5-5/5)

=(12-4+5)/12+4-5)

=13/11

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Ayush Sharma 6 years, 10 months ago

The ans is 13/21

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Places A and B are 80 km apart from each other on a highway. A car starts from A and another from B at the same time. If they move in same direction they meet in 8 hours and if they move towards each other they meet in 1 hour 20 minutes. Find the speed of cars

Posted by Harsh Lakra 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Swetanshu Kumar 6 years, 10 months ago

let speed of car A and car B be x and y respectively. 80/x-y=8 10/ x-y=1 10=x-y (eq.1) 80/x+y=80/60 1/x+y=1/60 x+y=60(eq.2) solving eq. 1 and 2 x=35 y=25 speed of car A is 35 km/ hr. speed of car B is 25 km/ hr.

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Mishthi ? 6 years, 10 months ago

35km/hr and 25km/hr

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Use accu 1111 division algorithm to find the HCF of 135 and 225

Posted by Arshdeep Singh 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Ram Kushwah 6 years, 10 months ago

225=1*135+90

135=90*1+45

90=45*2+0

hence HCF=45

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Ayush Sharma 6 years, 10 months ago

HCF OF 135 AND 225. IS 45

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In linear equation when we use graphical method how we'II have to take the X value so when we will put it in equation we will get the value of Y

Posted by Pratha Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Priya Darshni 6 years, 10 months ago

By any method by elimination, etc..

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Name the measure of central tendency which take into account all data items

Posted by Mala Ramachandran 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Bhavya Narula 6 years, 10 months ago

Mean

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3by2 of right angle

Posted by Aditi Bhure 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Ram Kushwah 6 years, 10 months ago

135

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a³+ab²÷a²+b²

Posted by Kush Gupta 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Arpit Rathpre 6 years, 10 months ago

a(a^2+b^2)/(a^2+b^2) =a

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Find the volume of largest right circular cone that can be cut out from a cube edge 4.2 cm.

Posted by Shahnawaz Akhtar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Nitin Dadhich 6 years, 10 months ago

19.40 cm^3

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Anshu Rai ? 6 years, 10 months ago

Radius of cone =2.1 cm Height of cone = 4.2 cm Volume of cone = πr²h =π*2.1*2.1*4.2 = 58.188 cm³

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In a circle of diameter 40cm a rhombus is inscribed with all its vertices on the cir le find the area of the rhombus

Posted by Sachin Saini 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 6 years, 10 months ago

When a rhombus is inscribed with all its vertices than its diagonals will be the diameter of the circle
length of the diagonal= 40cm
area of rhombus = 1/2 x diagonals²
= 1/2 x 40 x 40
= 800 cm²

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In a triangle ABC, write cos (B+C)/2 in terms of angle A.

Posted by Sumit Kain 6 years, 10 months ago

CBSE > Class 10 > Mathematics