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Various steps we can take to stop or minimize environmental degradation.like:

1.Industrial waste must be recycled as possible as maximum.2.The solid waste of industries should not be thrown in running water.i.e.(River,lake).Industrial wastes are not allowed to be disposed in water bodies.3.Deforestation should be avoided as more and more trees are being are cut down to set up new industries.. 4. Industries are now given a certain area which they cannot extend or use materials in excess from the environment.

Let AO=HCD=OB=60mA'B=AB=(60+H)m

In triangke AOD,tan30'=AO/OD=H/OD

H=OD/√3OD=√3 H

Now, in triangle A'OD,tan60'=OA'/OD=(OB+BA')/OD√3=(60+60+H)/√3 H =(120+H)/√3 H=>120+H=3H 2H=120 H=60m

Thus, height of the cloud above the lake = AB+A'B =(60+60) = 120m

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Given : The sequnce is in APd = 1 - 3 = -2

After -3, term is -3 -2 = -5

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204/10 = 20.4 ( put decimal after one decimal from right side)

Using formula of nth term an = a + (n-1) d

Here, given that a2 = 2 => a+d = 2 ..............(1)&a7 = 22 => a+6d = 22.... .....(2)

solving (1)&(2) we get(2-d) + 6d = 22=> 5d = 22-2= 20=> d = 4now put the value of d in (1) we get, a + 4= 2=> a= -2

Now, Using formula for sum of first n termsSn = n/2{2a + (n-1) d}

The sum of first 30 terms of an A.P.= Here, n= 30= 30/2 {2×(-2) +(30-1)×4}= 15 {-4 +120 - 4}= 15 × 112= 1680

Hence, The sum of first 30 terms of an AP = 1680

Suppose, Varun income is 100then income of Rahul will be 85hence percent will be (100-85)/85 *10017.64%

hence sum is 900

he is currently moving on west

I day=13/5km11/2 days=13/5*11/2=14.3km

If mode is 10then we have seen that no.s of 7 and 10 are equal I.e 3then p-2 will also be equal to 10 in order to make mode 10so, p-2=10p=12

speed of ritesh = 3(1/3)km/h = 10/3km/h

now time to cover 10km = 10/(10/3) = 3hrs

a = -10d = -12 - (-10) = -12+10 = -2So next term is fifth term = a+4d = -10 + 4(-2) = -10 - 8 = -18

Let the speed in still water be x km/hr Then, [6/(x + 4)] + [6/(x - 4)] = 2 ⇒ 6[ x - 4 + x + 4] = 2(x2 - 16)⇒ x² - 6x - 16 = 0 ⇒ (x - 8) (x + 2) = 0 ∴ x = 8 km/hr

Let the speed in still water be x km/hrThen, 6/x + 4 + 6/x - 4 = 2⇒ 6[ x - 4 + x + 4] = 2(x2- 16)⇒ x2- 6x - 16 = 0⇒ (x - 8) (x + 2) = 0∴ x = 8 km/hr

VSEPR postulates:1)For polyatomic molecules containing three or more atoms, one of the atoms of that molecule is called the central atom to which all the other atoms are linked.2)The shape of a molecule depends upon the total number of valence shell electron pairs.3)The electron pairs tend to occupy positions in space such that the electronic repulsion gets minimized and hence the distance between them is maximized.

In one day Ramesh can do = 1/25 work

In one day Umesh can do = 1/30 work

In one day both can do= 1/25 + 1/30= (6 + 5)/150= 11/150 work

Both can finish work in 150/11= 13.5 days

1 2/3km =3+2/3=5/3kmhe walks 3/4km 5/3-3/4=20-9/1211/12kms by auto-rickshaw

7m + 8b =1/2. work in a day-------(1)4m + 12b=29/56. work in a day-------(2)

Multiply equation (1) by 12Multiply equation (2) by 8

I. e, 84m + 96 b =6- 32m + 96 b =(29/7) -------------------------- 52m. =(13/7)

m =(13/7) = 1 --------- ----- work in a day 52. 28

A man can do work in 28 days

consider a be arbitrary element of set A

11.

The autonomic nervous system is divided into three parts: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system. The autonomic nervous system controls smooth muscle of the viscera (internal organs) and glands.

but the answer is 180

Ratio of 25 days to 15 hours

1 day = 24 hours

25 days = 24 × 25 hours

Ratio of 25 days to 15 hours

24 × 25 : 15

24 × 5 : 3

8 × 5 : 1

40 : 1

6x+3y=k-312x+ky=k

It has infinite solution when they are coincident lines

Multiply equation 1 with 2

12x+6y=2k-612x+ky=k

Comparek=6, 2k-6=kk=6

85km/hr as it at the speed of 1445/2 km in 17/2 hr

600-88+54600-142=458458 apples are left

right answer is 458 of the correct

1.72.3.friday4.3rd5.last6.thursday7.friday

1=72=Monday 3=Friday 4=35=7 6=Thursday7=Friday 8=Sunday and Tuesday 9=Wednesday and Friday 10=5th

1. 72. Monday3. Friday4. third5. last6. Thursday7. Friday8. Sunday and Tuesday9. Wednesday and Friday10. 5th

1. seven2.monday3.thrusday4.third5.seventh6.thrusday7.sunday8.sunday or tuesday9

1. There are seven days in a week

1=72=Monday3=Friday4=3rd5=Last6=Thursday7=Sunday8=Sunday and Tuesday 9=Tuesday and Friday 10=5th day

7daysMondayFridaythirdlast or seventhThursdaySundaySunday and TuesdayWednesday and Fridayfifth

1. 72. Monday3. Friday4. Third5. Last6. Thursday7. Friday8. Sunday and Tuesday9. Wednesday10. 5th

fifth day of the week is Friday

There are Wednesday days in a week

Sunday is the seventh day of the week

Saturday come before Friday

7, Friday, third, seventh-day, Thursday Sunday and Tuesday, Wednesday and Friday, fifth

Monday lies between the Sunday

1. 7 days2. Monday3.friday4.third day5.1day6.thursday7. Friday

7 Monday Thursday fourth 1 Thursday

seven , Monday, Friday, third, last, Thursday,

1. 72. monday3. friday4. Third5. 76.thursday7. sunday

1=78=sunday Tuesday 2=monday3=friday4=30th5=last6=saturday7=friday9=Wednesday friday10=5

1. 72. monday3.friday 4 3rd5.seventh6.thursday7.sunday8. Sunday and Tuesday 9. Wednesday and Friday10. 5th

there are seven days in a week

Monday is the first day of the week

Thursday lies between Wednesday

the day of the week is Friday

7• Saturday comes before Friday

7 weekMondayThursday

1)7 2)Sunday 3)Thursday 4)4 5)1 6)Thursday 7)Sunday 8)Sunday and Tuesday 9)Wednesday and Friday 10)6

1=seven2=Monday3=Friday4=third5=last day6=Thursday7=Sunday 8= Sunday and Tuesday9=Wednesday and Friday10= fifth

7MondayThursdaythird dayseventh daycome after Thursdaycome before FridaySunday and TuesdayWednesday and Friday5day

1=72=Monday3=Friday4=third day5= last day6=Thursday7=Friday8=Sunday and Tuesday9=Wednesday and Friday10=fifth day

1. 72. Monday3. Friday4. 35. 76. Thursday7. Friday8. Sunday , Tuesday9. Wednesday, Friday10. 5

7MondayFriday37ThursdayFridaySunday and TuesdayWednesday and Friday5

1)72)Monday3)Friday4)3rd5)7th (last)6)Thursday7)Sunday8)Sunday and Tuesday9)Wednesday and Friday

1. 7 days2. Monday3. Friday4. third5. last or seventh6. Thursday7. Sunday8. Sunday and Tuesday9. Wednesday and Thursday10. fifth

1. 72. monday3. friday4. 3rd5. last6. thursday7. friday

1. Seven2. Sunday3. Thursday4. Fourth5. First6. Saturday7. Friday8. Sunday and Tuesday9. Wednesday and Friday10. Sixth