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

It is the method by which the value of a variable in equation 1 is substituted in another equation and the value of the other variable in equation 2 is substituted in equation 1 or equation 3 made by equation 1. Let's understand it with an example: x+y=2............. eq 1 x-2y=1............. eq 2 In equation 1, x+y=2 x=y-2............. eq 3 substituting the value of x in equation 2 x-y=1 (y-2) -2y=1 y-2-2y=1 -y-2=1 -y=1+2 -y=3 [y= -3] Substituting the value of y in equation 3 x=y-2 x=-3-2 [x=-5] Hope you understood.

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If the age of father is 3 times the age of son,if the age of son is 15.what is the age of father?

Posted by Saleem Gani 5 years, 1 month ago

CBSE > Class 10 > Mathematics

4 answers

P B Student 5 years, 1 month ago

Age of father is 45years

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King'S _Son 5 years, 1 month ago

let age of son be = x yr old then the age of father =3x given son's age = x=15 yr . therefore the age of father = 3x=3(15) = 45 . yr thank you ?

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Paru ? 5 years, 1 month ago

Age of father is 45 years

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Damak Chaudhary 5 years, 1 month ago

Age of son = 15 Age of father = 3 times age of son =3×15 = 45 years. (ans) = age of father.

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The 4th term of an AP is 0. Prove that its 25th term is triple than its 11th term.

Posted by Paru ? 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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The difference of squares of two numbers be 88 in the larger number is 5 less than twice the smaller number then find the two numbers or solve for x x-1 divided by 2 X + 1 + 2 X + 1 divided by x-1= 2 ,X is not = to -1÷2, 1

Posted by Vaishali Suryavanshi 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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A+B+B+B+80+90=100 solve this question

Posted by Binaya Kumar Chhatria 5 years, 1 month ago

CBSE > Class 10 > Mathematics

4 answers

Yangzee Sherpa 5 years, 1 month ago

If uh already knew the answer den y uh asked????? Anyway I liked the answer??? ???

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Binaya Kumar Chhatria 5 years, 1 month ago

A stand for akad,B stand for bakkad, B stand for bambe, B stands for bo,so the answer is akkad bakkad bambe Bo assi nabbe poore sau

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Binaya Kumar Chhatria 5 years, 1 month ago

Koi janta hai kya ise sabal ka answer

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Yangzee Sherpa 5 years, 1 month ago

?IDK? ???

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If the sum of the zeroes of the polynomial p(x) = (a + 1)x2 + (2a + 3)x + (3a + 4) is -1, the find the product of the zeroes

Posted by Asmita Belapurkar 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Ujjwal Rajput 5 years, 1 month ago

Search Google

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Write the denominator of the rational number 257/500 in the form 2^m×5^n, where m and n are non-negative integers. Hence, write the decimal expansion without actual division

Posted by Vedshri Anantwar 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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Derive distance formula

Posted by Pamarthi Kushmitha 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Mani Jha 5 years, 1 month ago

Speed is equal to distance over time The ,,distance is equal Speed into distance

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समीकरणों 2x+y=6, x-2y+2=0 का ग्राफ कीजिए इन दोनों रेखाओं और x-अक्ष से बने त्रिभुज के शीर्ष ज्ञात कीजिए तथा प्राप्त त्रिभुज का क्षेत्रफल ज्ञात कीजिए |

Posted by Kamal Sheikh 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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Is completing the square topic in the syllabus of this year?

Posted by Shreya Jha 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Shreya Jha 5 years, 1 month ago

Okay thank you?

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?Isha .B 5 years, 1 month ago

Yes....

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Chapter 2 all solutions

Posted by Yamuna Chettri Yamuna Chettri 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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213446/35789

Posted by Dev Singh 5 years, 1 month ago

CBSE > Class 10 > Mathematics

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Trignometry 1. The value of cos 0°. cos 1°. cos 2°. cos 3°… cos 89° cos 90° is (a) 1 (b) -1 (c) 0 (d) 12√ 2. If x tan 45° sin 30° = cos 30° tan 30°, then x is equal to (a) √3 (b) 12 (c) 12√ (d) 1 3. If x and y are complementary angles, then (a) sin x = sin y (b) tan x = tan y (c) cos x = cos y (d) sec x = cosec y 4. sin 2B = 2 sin B is true when B is equal to (a) 90° (b) 60° (c) 30° (d) 0° 5.If A and (2A – 45°) are acute angles such that sin A = cos (2A – 45°), then tan A is equal to (a) 0 (b) 13√ (c) 1 (d) √3 6. If y sin 45° cos 45° = tan2 45° – cos2 30°, then y = … (a) –12 (b) 12 (c) -2 (d) 2 7. If sin θ + sin² θ = 1, then cos² θ + cos4 θ = .. (a) -1 (b) 0 (c) 1 (d) 2 8. 5 tan² A – 5 sec² A + 1 is equal to (a) 6 (6) -5 (c) 1 (d) -4 9. If x = a cos 0 and y = b sin 0, then b2x2 + a2y2 = (a) ab (b) b² + a² (c) a²b² (d) a4b4 10. What is the maximum value of 1cscA? (a) 0 (b) 1 (c) 12 (d) 2 11. What is the minimum value of sin A, 0 ≤ A ≤ 90° (a) -1 (b) 0 (c) 1 (d) 12 12. What is the minimum value of cos θ, 0 ≤ θ ≤ 90° (a) -1 (b) 0 (c) 1 (d) 12 13. If cos 9A = sin A and 9A < 90°, then the value of tan 5A is (a) 0 (b) 1 (c) 13√ (d) √3 14. If in ΔABC, ∠C = 90°, then sin (A + B) = (a) 0 (b) 1/2 (c) 12√ (d) 1 15. If sin A – cos A = 0, then the value of sin4 A + cos4 A is (a) 2 (b) 1 (c) 34 (d) 12

Posted by Riddhi Chauhan 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 3 years ago

1. Answer = 0

Step-by-step explanation:

the value of the series cos0°.cos1°.cos2°.cos3°.......cos89°.cos90° is '0' because the value of cos90° is 0 so,hence the value of the series is 0.

Answer: x = 1

Step-by-step explanation:

xtan45sin30 = cos30(sin30/cos30)

x(1)(1/2) = sin30

x/2 = 1/2

x = 1

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Solve for x :‐ a÷(x‐a) + b÷(x‐b) = 2

Posted by Raspreet Singh 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

Solution:

Given

First take the LCM of denominators in the left hand side of the given equation.

Now lets factorise the quadratic equation in

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What is A-A-A criteria for triangles

Posted by Parita Kumari 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Malaika Sharma 5 years, 1 month ago

⛦Angle Angle Angle criteria⛦ Eg-ABC and PQR are two ?'s If Angle A=Angle P AngleB=Angle Q And Angle C=AngleR Then the two triangles are similar by AAA criteria.

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Gaurav Seth 5 years, 1 month ago

AA (or AAA) or Angle-Angle Similarity

If any two angles of a triangle are equal to any two angles of another triangle, then the two triangles are similar to each other.

From the figure given above, if ∠ A = ∠X and ∠C = ∠Z then ΔABC ~ΔXYZ.

From the result obtained, we can easily say that,

AB/XY = BC/YZ = AC/XZ

and ∠B = ∠Y

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What is the role of zero in maths?

Posted by Arunpratap Singhbhadoriya 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years ago

0 (zero) is a number, and the numerical digit used to represent that number in numerals. It fulfills a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, 0 is used as a placeholder in place value systems.

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Prove that the ratio of areas of two triangles is equal to the ratio of the square of their corresponding sides

Posted by Rajan Singh 5 years, 1 month ago

CBSE > Class 10 > Mathematics