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if ROOTS are = then D=o

b2-4ac=o

then SUBSTITUTE the VALUE

PH AND PLANTS

Plants require a specific pH of the soil for their proper growth. Plants cannot grow in too alkaline or too acidic soils. Therefore, for proper cultivation of crops it is IMPORTANT to have knowledge of the pH of the soil. If the soil is too acidic then its pH can be raised by adding lime (or slaked lime) which neutralizes the excess acid in the soil.



Similarly, if the soil is too alkaline then its pH can be lowered by adding gypsum or some other substance which can neutralize the excess alkali present in the soil.

 

pH IN OUR DIGESTIVE SYSTEM

The medium in our stomach is highly acidic and has pH around 1.2. Our stomach produces hydrochloric acid which helps in digestion of food. Sometimes the stomach produces too much hydrochloric acid. Excess acid in the stomach causes pain and irritation. It can also CAUSE ulcers in the digestive system. The condition of excess acid in the stomach is referred to as hyperacidity. In order to treat hyperacidity, a patient is advised to take antacid tablets or antacid suspensions. The antacid preparations contain some mild base such as magnesium hydroxide as the active component which neutralizes the excess acid in the stomach and thus controls the pH in the stomach.

Mg(OH)2 + 2HCl à MgCl2 + 2H2O

 

pH AND TOOTH DECAY

Tooth enamel is the hardest substance in our body. It is made up of calcium tetraoxophosphate(V). It does not dissolve in water and mildly acidic solutions. However, it gets CORRODED slowly when pH in the mouth is below 5.5. When we eat food, some food particles REMAIN sticking to the teeth. Bacteria present in the mouth produce acid by the degradation of sugar and food particles present in the mouth. This results in lowe1ing of pH in the mouth which promotes tooth decay. In order to prevent tooth decay AVOID eating sugary foods. The mouth should be cleaned after eating food. Cleaning the teeth using toothpastes also helps in preventing tooth decay. Toothpastes are generally basic, therefore, they neutralize the excess acid in the mouth and thus prevent tooth decay.

The knowledge of pH also helps us in maintaining the proper acidity in many products such as shampoos, medicines, etc. pH of rain water can be used to detect the extent of certain pollutant gases in the atmosphere.

I hope it will help you

Side-Side-Side (SSS) RULE

Side-Side-Side is a rule USED to prove whether a given set of triangles are congruent.

The SSS rule states that:

If THREE sides of ONE triangle are equal to three sides of another triangle, then the triangles are congruent.

In the diagrams below, if AB = RP, BC = PQ andCA = QR, then triangle ABC is congruent to triangle RPQ.



Cube by Column method

For FINDING the cube by column method USE the FOLLOWING formula:- 
(a + B) 3 = a 3 + 3a 2 b + 3ab 2 + b 3 
In this method, first find the 2 digits of a number. 

I hope it's HELP U :-)

1/5+1/4 EQUAL to X/2-x/3
4+5/20 equal to 3x-2x/6
9/20×6 equal to x
54/20 equal to x
2.7 Equal to x

2/3 and 3/4

MAKE DENOMINATORS same

2/3 x8/8=16/24

3/4 X 6/6=18/24

therefore 17/24 LIES between 2/3 and 3/4

REAL.........as its PRONOUNCIATION is DIFFERENT

3450 in 3:5:7

3/15 * 3450 = 690

5/15 * 3450 = 1150

7/15 * 3450 = 1610

690:1150:1610

(60+3)^3
(x+y)^3=x^3+3(x^2y)+3(xy^2)+y^3
=60^3+3(60^2 3)+3(60 3^2)+3^3
=216 000+32 400+1620+27
=250 047=63^3
Pls mark this as the BRAINLEIST

Where is ATTACHMENT DEAR

Could you PLEASE JUSTIFY your questions because your QUESTION doesn't MAKE any SENSE

You have to GIVE TWO equations

pls MARK BRAINLIEST

Simple have LINEAR line have a COMPASS rotate180 flio REVERSE DRAW obtuse line you get 150

Process is EXPLAINED below.

Given:

     Height and weight of family members.

To find:

    How can we calculate average height and weight of family members.

Explanation:

• Measure height of all family member.
• The unit of height must be same.
• Add all the height of family member
• DIVIDE the Sum of height in to number of family member.
• We can get average height of all family member.
• Example: Height of family member are 160 , 168 , 145 cm
• Average height of family members = = 157.66 cm.
• Similar process follow to find average weight of family members.

To learn more....

1)The average of 7 number is 48 if TWO of them are 56 and 60 find the average of the Other five numbers.

brainly.in/question/6325189

2)The average of 10 numbers us 62 if the average of FIRST 9 of them is 63 find the 10th number.

brainly.in/question/5159939

We can explain INTEGER CONSTANT in c++ as c+0+0 which means c as a constant
Example: SUPPOSE 10+0+0 which DIRECTLY means 10 which is contsant

Average = (TOTAL quantity)/(No. of quantities)

So,

LET the present age of the child be x

Now, three years back, the average age of FAMILY was 17

So,

Total age = 17×5 = 85 years

Now,

The present age average is still 17

So, in three years the individual age of the members will also increase

Increase in age of five family members = 5×3 = 15

So,

By present,

(15+85+x)/6 = 17

x=102 - 100

x=2

So,

The present age of the child is 2 years

91.44 CENTIMETER =1 YARD

Since a , b and c are in AP THEREFORE it's difference should be EQUAL that is b-a=c-b=d , d for difference in 4a ,4b and 4c ... d= 4b-4a that is 4(b-a) and similarly with 4c and 4b ....d =4(c-b)....there for if we equate all d then 4(b-a)=4(c-a) that is b-a and c- b hence proved

-21b.pls MARK BRAINLIEST

D,,,,,, A,,,,,, B,,,,,,,, C

Only 2 GOT their wet BCOZ the third PERSON didn't had HAIR on his head




easy peasy

Both are of EQUAL WEIGHT

SP = 11520

D1 = 20%

D2 = 10%

MP = 100/(100-D%) x SP

= 100/(100-20) x 11520

= 100/80 x 11520

= 14400

Now SECOND DISCOUNT

Mp = 100/(100-10) x SP

= 100/90 x 14400

= 16000

So MP was 16000 before two successive DISCOUNTS

3/4*8/12

=2/4


that's all

2.7 × 1.5 × 2.1 = 8.505

Hi there

Your answer is :-

◆ Mathematically it is not possible .

◆ But if you ADD ONE stroke to ( + ) it will become FOUR :-

5 + 5 + 5 = 550

5 4 5 + 5 = 550 or 5 + 5 4 5 = 550

550 = 550

LHS = RHS

Hence Proved

Thank You

Here is your ANSWER

40+4= 44
HOPE it HELPS you

According to the QUESTION,

24th term = 2( 10th term )

a + 23d = 2 ( a + 9d )

a + 23d = 2a + 18d

23d - 18d = 2a - a

5d = a ----1equation

Hence,

To Prove : 36th term = 2( 16 th term )

RHS = 2 ( a + 15 d )

= 2a + 30d

= 2( 5d ) + 30d

= 10d + 30d

= 40d

LHS = 36th term

= a + 35D

= 5d + 35d

= 40d

40d = 40d

RHS = LHS

PROVED.

Quwait : POUND. . .

-1/5° means 1/5° ×π/180 0.0020943951 since "-" SYMBOL DENOTES quadrant in which ANGLE is NEGATIVE hence answer will be -0.0020943951 rad

or -π/900

The HCF of two CONSECUTIVE even number is ALWAYS an even number

Given x = 1 y = 1


x^2 + y^2 +xy^2

=> ( 1 )^2 + ( - 1 )^2 + ( 1 )( - 1 )^2

=> 1 + 1 + 1

=> 3 >>> ANSWER


HOPE it helps