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

Subba rao starting salary = 5000 i. e, a = 5000 Annual incriment = 200 => d = 200 So, A. P = 5000, 5200, 5400,....... So an = 7000 ==> 7000 = a +( n-1) d 5000+ (n-1) 200 =7000 (n-1) 200 = 2000 (n-1) = 10 ==> n = 11 Hence his income will reach 7000 in the year 2006.

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An electric pole is 10 m high . A steel wire tied to top of the pole is affixed at apoint in the ground to keep the pole upright . If the wire makes an angle of 45° with the horizontal through the foot of the pole ,find the length of the wire

Posted by Anshika Choudhary 6 years ago

CBSE > Class 10 > Mathematics

3 answers

Ram ? 6 years ago

10 root 2 m

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Surendra Kumar 6 years ago

10√3

2Thank You

Prateek Gupta 6 years ago

10√2m

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If the angle of elevation of a cloud from a point H metres above a lake is alpha and angle of depression of its reflection in the lake is beta , prove that height of the cloud is H(tan \beta +tan \alpha ) / tan \beta -tan \alpha .

Posted by Jayesh King 6 years ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

What is value of root -2

Posted by Ayush Negi 6 years ago

CBSE > Class 10 > Mathematics

5 answers

Ayush Negi 6 years ago

Thanks for answering mates

1Thank You

Ansh Ika 6 years ago

Not 1.414 ,imaginary number banega to hoga 1.414i.i matlab iota..use hota h na aapne pdha hoga

1Thank You

Surendra Kumar 6 years ago

1.414

1Thank You

Ishita Sharma 6 years ago

Hi mate...... Value of root -2 is : *1.414*

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Aryan Pandey 6 years ago

1.414

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The distance of the point (2,3)from the X-axis

Posted by Harsh Vardhan Singh 6 years ago

CBSE > Class 10 > Mathematics

2 answers

Aryan Pandey 6 years ago

3 units

1Thank You

Aviral Goyal 6 years ago

3 units

1Thank You

ANSWER

Important question in exam all chapters

Posted by Harshit Rastogi 6 years ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

4.3 quesion 2ka first part

Posted by Priyanka Kashyap 6 years ago

CBSE > Class 10 > Mathematics

1 answers

Miss. 1234 6 years ago

Excuse me, solution is given in this app.....

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ANSWER

find probability of an impossible event

Posted by Bakil Raghu 6 years ago

CBSE > Class 10 > Mathematics

5 answers

Aryan Pandey 6 years ago

0Thank You

Sandhya Yadav 6 years ago

0Thank You

⛩Singh Emperor ???? 6 years ago

Zero

2Thank You

Saket Yadav 6 years ago

0Thank You

Miss. 1234 6 years ago

4Thank You

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Construct a triangle whose perimeter is 13.5 cm and the ratio of sides is 2:3:4

Posted by Soham Sharma 6 years ago

CBSE > Class 10 > Mathematics

3 answers

Miss. 1234 6 years ago

triangle*

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Miss. 1234 6 years ago

x=1.5.........therefore, sides of triangles = 3cm , 4.5cm and 6cm

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Yuvraj Singh 6 years ago

Let them be as 2x 3x and 4x use pythagoras theorem to find out x and do the construction

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If a=2 and d=8 and Sn=90 . Find n and an.

Posted by Salman Yadav 6 years ago

CBSE > Class 10 > Mathematics

4 answers

Gaurav Kumar 6 years ago

Sn=n/2(2a+(n-1)d) 90=n/2(4+8n-8) 180=n(8n-4) 8n²-4n-180 2(4n²-n-45) n=-9/2,n=5

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Arpit Maurya 6 years ago

90 = n/2(4+(n-1)8) 180= n(4+8n -8) 180= -4n+8n^2 8n^2-4n -180 =0 Solve it for n

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Yogita Ingle 6 years ago

Sn = 90
Sn = n/2 [ 2a + (n - 1)d]

90 = n/2 [ 2 x 2 + (n - 1)8]
180/n = 4 + 8n - 8
180/n = 8n - 4
180 = 8n^2 - 4n
{tex}8n^2 - 4n - 180 = 0{/tex}
{tex}2n^2 - n - 45 = 0{/tex}
{tex}2n^2 - 10n + 9n - 45 = 0{/tex}
2n( n - 5) + 9( n - 5) = 0
(2n + 9)(n - 5) = 0

n = -9/2 or n = 5
But n cannot be negative.
So, n = 5
a_n= a + (n - 1)d
a₅ = 2 + (5-1)8
a₅ = 2 + 4 x 8
a₅ = 2 + 32 = 34

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Siva Kumar 6 years ago

N=5,an=34;if n=9/2,an=38

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If tanA=cotB prove that A+B=90°

Posted by Harshit Rastogi 6 years ago

CBSE > Class 10 > Mathematics