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cos75°=cos(45°+30°)=cos45°cos30°-sin30°sin45° = (1/√2)(√3/2)-(1/2)(1/√2)=(√3-1)/2√2

given that in a primary school has the answer wiilbe 9 teachers

If there are 3 teachers for 60 students,Therefore for 20 students 1 teacher will be needed.

For 400 students ,teachers required=400/20 =20 teachers

20 is the right answer of the following

60 student =3 teacher1 teacher=20 student400student=400/20=20 teacher

20 teacher is the right answer

if 3 teacher for 60 students said that 1 teacher = 60/3 = 20 students so that in 400 students = 400/20 = 20. teachers

20 teachers is the right answer

primary school have 9 teacher

x + 4y = 45 3x + 6y = 75 3x + 12y - 3x - 6y = 35 - 75 6y = 60 y = 10 x + 40 = 45 x = 5 mx + ny = 86 5m + 56×10 = 86 5m = 86 - 560 = -474 m = -94.8

SinA =1/√5cosA=√(1-sin²A) (sin²A+cos²A=1)=√1-1/√5² (1-cos²A=sin²A=√1-1/5. (cosA=√1-sin²A) =√5-1/5=√4/5cosA=2/√5sinB =1/√10cosB=√1-sin²B=√1-1/√10²=√1-1/10=√10-1/10=√9/10cosB=3/√10Cos(A+B)=cosA. cosB-sinA. sinB=2/√5 x 3/√10 - 1/√5 x 1/√10=6/√50-1/√50=5/√50=5/5√2=1/√2cos(A+B)=1/√2Cos(A+B)=Cos 45°A+B=45°

Rain is formed during a process which is usually known as the water cycle. The water cycle involves a number of steps, including evaporation, cloud formation, precipitation (rain), relocation, and then evaporation again.

Evaporation occurs when liquid water is vaporised into water vapour, allowing it to become a part of the atmosphere. Heat from the sun acts on the water molecules in liquid water, increasing their energy. These particles then ‘break away’ from the liquid, becoming airborne. When there is high humidity it simply means that there is a high concentration of water molecules in the air: a lot of evaporation has occurred.

When the amount of water vapour in the air reaches a level where no more water can evaporate, we say that the air is fully saturated, or that the humidity is at 100%. If the conditions then change so that the air can hold less water vapour (for example, if it gets colder or the barometric pressure decreases), then some of it will begin to condense and form liquid water again. To begin with, only tiny particles of water will be formed which are too light for gravity to pull them back to the ground. If this happens near ground level, fog or mist will be formed. However, if it happens in the upper atmosphere, we will see collections of these water particles as clouds.

Inside a cloud, the tiny water particles move around, bumping into each other. When they hit each other, they can combine to form a larger droplet. Once this has happened enough times, a droplet of water which is heavy enough to fall to the ground is formed. The form of this fall – known as precipitation – depends on atmospheric conditions. It may be snow, rain, sleet, hail, etc. Once precipitation, or rainfall, has occurred, the liquid water will move around the earth’s surface, usually towards the ocean, until it is evaporated again and the cycle restarts.

Rationalising means making an surd into rational number Heere √8=√4 ×√2√8=2√2=2√2rationlising means converting into rational here 2√2 is not a rational so, converting by multiplying 2√2 by √2 Then we get ,4 as number Here, 4 is a rational number so, rationalising factor of √8 is √2

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Profit = 20% = 360 Rs

So, Cost Price = 360 / 20 * 100 = 1800 Rs

And Sales Price = 1800 + 360 = 2160 Rs

Discount = 25% of marked price

So Sales Price = (100 - 25) % = 75% of marked price

=> 2160 = 75% of marked price

=> marked price = 2160 / 75 * 100 = 2880 Rs

bhaiya thank you...

mam formula type answer dejia

ghanks

the strength of a school is 2500 .out of this,600 are in pre_primary section ,700 in middle school,and the remaining are in high school ,and in high school .Find the percentage of students in each section?600 in pre primary,700 in middle and remaining in high school.so students in high school=(2500-(600+700))=1200so percentage of pre primary students=(600/2500)*100=24%percentage of middle school students=(700/2500)*100=28%percentage of high school students=(1200/2500)*100=48%

thank you sir

no. of male teachers = 56-42 = 14. so a) 14:42 = 1:3b) 42:14 = 3:1c) 14:56 = 1:4

thanks

Given quadratic equation: t² − 12xt − (f(x) + 64x)=0roots are: (12x±√(144x²+4f(x)+64×4x))/2±2√(36x²+f(x)+64x)/2 =6x±√(36x²+f(x)+64x)as one root is twice the other, or f(x)=-32x²-64xHere, f(x) is a quadratic equation with D ≧ 0 and aSo the maximum value at x = -b/2a = 64/(2×-32) = -1∴ The maximum value of f(x )= f(-1) = -32(-1)² - 64(-1) = 32 (Ans)

Let AB be the line segmentTherefore, A(6,-7) and B will be (x,-1) as y-coordinate is called ordinate and x-coordinate is called abscissa.By applying Distance Formula,AB²=(x2-x1)²+(y2-y1)²13²=(x-6)²+(-1+7)²169=x²-12x+36+36⇒x²-12x+72=169⇒x²-12x-97=0

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24= 2*2*2*336= 2*2*3*3comman factor = 2*2*312

2x = 2*x3x^2 = 3*x*x4 = 2*2

Since there is no common factor visible.

Therefore, 1 is the only common factor of the given terms.

A-B=3,6B-A=4,8 correct answer

A-B=3,6B-A=4,8is the best answer

A-B=3,6B-A=4,8 Answer.

12 is the right answer

Ans :- Internal energy is defined as the energy associated with the random, disordered motion of molecules. It is separated in scale from the macroscopic ordered energy associated with moving objects; it refers to the invisible microscopic energy on the atomic and molecular scale.

Area of paralelogram=b*h.=1 dam = 10 metres so,b=15*10=150.and h=8*10=80.Hence,80*150=12000.m^2.now,cost of watering=area *10=12000*10=120000paise=1200rupees.

(-7/8)+(8/9)=[-7×9 + 8×8]/8×9=1/72

Sn= ( n / 2) [ 2a + ( n -1)d sum of the first 7 terms of an A.P is 63 i. e S7= 63.( 7 / 2) [ 2a + 6d ] = 63

2a + 6d = 18 --------(1)

Sum of its next 7 terms = 161.

Sum of first 14 terms = sum of first 7 terms + sum of next 7 terms.14 पदों का योगफल बराबर होगा 7 पदों का योगफल + 7 पदों का योगफल

S14 = 63 + 161 = 224

( 14 / 2) [ 2a + 13d ] = 224.

7 [ 2a + 13d ] = 224.

⇒ [ 2a + 13d ] = 32 -------92)

BySolving equation (1) and (2) we obtainसॉल्व करने पर प्राप्त होगा

d = 2

a = 3.

t28= a + ( 28 - 1) d

t28= 3 + ( 28 - 1) 2

t28= 57.

28th term= 57.

578*161=93058 is the right answer

578×161=93058therefore 93058 is the right answer

I don't know of this answer

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