CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

Here we will tin-plate the inside of the hemisphere So, We need to find the curved surface area of hemisphere
Radius of hemisphere = r = /2 = (10.5/2) cm = 5.25 cm
Curved surface area of the hemisphere = 22 = (2×22/7×5.25×5.25) cm2 = 173.25 cm2
Cost of tin-plating 100 cm2 = Rs 16
Cost of tin-plating 1 cm2 = Rs 1/100 × 16
Cost of tin-plating 173.25 cm2 = Rs 1/100 × 16 × 173.25 = Rs 27.72
∴ Cost of tin-plating the hemisphere is Rs 27.72

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1/2-√3/√3

Posted by Ravish Aryan 3 years, 5 months ago

CBSE > Class 09 > Mathematics

1 answers

Ashutosh Padhy 3 years, 5 months ago

1/2-√3/√3 = 1/2-1 = 1-2/2 => -1/2 => -0.5 ...

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If x+√15=4, then x+1/x=

Posted by Monisha S 3 years, 5 months ago

CBSE > Class 09 > Mathematics

0 answers

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The rational number between –1/5 and –2/5 is

Posted by Monisha S 3 years, 5 months ago

CBSE > Class 09 > Mathematics

1 answers

Ashutosh Padhy 3 years, 5 months ago

A rational no. between -1/5 & -2/5 is : => -1/5+(-2/5)÷2 = -1+(-2)/5÷2 => -3/5÷2 = -3/5×1/2 => -3/10...

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Express 0.57 bar and 0.43 bar in form of p/q

Posted by Ansh Chanalia 3 years, 5 months ago

CBSE > Class 09 > Mathematics

1 answers

Dilpreet Singh Rider Second 3 years, 5 months ago

3Thank You

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√2/3 is a rational number

Posted by Hema Kalakoti 3 years, 6 months ago

CBSE > Class 09 > Mathematics

4 answers

Ashutosh Padhy 3 years, 5 months ago

False, √2/3 is an Irrational number because the numerator i.e., √2 is an Irrational number as we cannot define it in Whole numbers (=> 1.4142... which is non-terminating non-recurring) & 3 is a Rational number . But, we know the property that, if an Rational number is divided by an Irrational number we may get an Irrational number...

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Tanishk Jain 3 years, 5 months ago

root 2/3 is irrational number. the value of root 2 and root 3 non recurresive and non termination number therefor root 2/3 is irrational number.

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Harnarayan Sahoo 3 years, 5 months ago

It is irrational number

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Rk Thapa 3 years, 5 months ago

No its irrational

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Find three rational numbers lying between 3/5 and 7/8

Posted by Shruti Kumari 3 years, 6 months ago

CBSE > Class 09 > Mathematics

4 answers

Ashutosh Padhy 3 years, 5 months ago

Here, 3/5 < 7/8. So, let y = 7/8, x = 3/5 & n = 3 Since, d = y - x ÷ n + 1 •7/8 - 3/5 ÷ 3 + 1 => 35-24/40 ÷ 4 => 11/40 ÷4 => 11/160. Now, three rational numbers : •(x+d), (x+2d), (x+3d) => (3/5 + 11/160), (3/5 + 12/160), (3/5 + 13/160) => (96+11/160), (96+12/160), (96+13/160) => 107/160, 108/160, 109/160.

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Aryan Pal 3 years, 5 months ago

24/32 25/32 26/32

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Pooja Taliyan 3 years, 6 months ago

Now i am saw you the second trick was it also realted to it Firstly it was formula: D=y-x/n+1 (x+d) (x+2d) (x+3d)

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Pooja Taliyan 3 years, 6 months ago

First of all you will make same the denominater take LCM and now you can give between three numbers lyes between them

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Find three ration number between 3/5 and 7/8

Posted by Tanya . 3 years, 6 months ago

CBSE > Class 09 > Mathematics

1 answers

Sia ? 3 years, 6 months ago

We first convert 3/5 and 7/8 into rational no. with same denominator.
{tex}\Rightarrow {/tex} 3/5 = 3×8/5×8
{tex}\Rightarrow {/tex} 24/40
{tex}\Rightarrow {/tex} 7/8= 7×5/8×5
{tex}\Rightarrow {/tex} 35/40.
{tex}\therefore{/tex} Thus, Three Rational numbers- 24/40, 25/40, 26/40. or. 35/40, 34/30, 33/40.
Except these, Infinite no. of rational numbers can be found, If we have converted the no.s to the Denominator.

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Draw 2 root 3 in the number line

Posted by Shruti Maharana 3 years, 6 months ago

CBSE > Class 09 > Mathematics

0 answers

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write 3 root 12 , 4 root 20 , 6 root 25 , root 80 and 12 root 112 in ascending order

Posted by Ravjyot Kaur 3 years, 6 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

What is rationalization and give its examples also?

Posted by Jai Prakash Yadav 3 years, 6 months ago

CBSE > Class 09 > Mathematics

1 answers

Sia ? 3 years, 6 months ago

Rationalization is an attempt to logically justify immoral, deviant, or generally unacceptable behavior. In Freud's classic psychoanalytic theory, rationalization is a defense mechanism, an unconscious attempt to avoid addressing the underlying reasons for a behavior.
Most of us engage in rationalization on a semi-regular basis. A person might account for a bad mood or general rude behavior by explaining that bad traffic affected the morning commute, for example. Someone who is passed over for a promotion might rationalize the disappointment by claiming to not have wanted so much responsibility after all.

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Check x-1 is a factor of x²-3x+2 or not

Posted by Joseph Victor 3 years, 6 months ago

CBSE > Class 09 > Mathematics

2 answers

Bhumika Kubhar 3 years, 6 months ago

Noo

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Joseph Victor 3 years, 6 months ago

5Thank You

ANSWER

Find the value of (256)0.16 ×(256)0.09

Posted by Pragya Ks 3 years, 6 months ago

CBSE > Class 09 > Mathematics

1 answers

Sia ? 3 years, 6 months ago

(256)^0.16+0.09
= (256)^0.25
=(256)^25/100
=(4^4)^1/4
=(4)^4x1/4
= 4

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Can any one give a proper definition of irrigation number?

Posted by Sanjana Behera 3 years, 6 months ago

CBSE > Class 09 > Mathematics

2 answers

Sia ? 3 years, 6 months ago

Irrigation is the process of applying water to the crops artificially to fulfil their water requirements. Nutrients may also be provided to the crops through irrigation. The various sources of water for irrigation are wells, ponds, lakes, canals, tube-wells and even dams. Irrigation offers moisture required for growth and development, germination and other related functions.

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Girdhar Arora 3 years, 5 months ago

I think u are saying irrational not irrigation as irrigation is not a number ? Irrational are a type of real number which can't be represented in p/q form where q is not =to 0 and it's decimal expansion is non -terminating and non-recurring(repeating .)

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If cos a minus b is equal to root 3 by 2 and sin a + b is equal to root 3 by 2 find a and b and a minus b are acute angle

Posted by Mitra Rajesh 3 years, 6 months ago

CBSE > Class 09 > Mathematics