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Given data :-

• A HOLLOW garden ROLLER if 42 CM diameter and length 147 cm is made of cast iron of 2cm thickness.

Here,

→ Diameter of roller ( d ) = 42 cm

→ Height of roller ( h ) = 147 cm

→ Thickness of iron ( t ) = 2 cm

Solution :-

To find the volume of the iron used in the roller .

{From given}

→ Radius of roller ( R ) = ½ × d

→ Radius of roller ( R ) = ½ × 42

→ Radius of roller ( R ) = 21 cm

Here, radius of roller without thickness of iron {which is used in roller}.

→ radius of roller ( r ) = R - t

→ radius of roller ( r ) = 21 - 2

→ radius of roller ( r ) = 19 cm

Now we use formula to find volume of the iron used in the roller.

→ Volume of iron = π [ R² - r² ] h

→ Volume of iron = 22/7 [ (21)² - (19)² ] 147

→ Volume of iron = 22/7 [ 441 - 361 ] 147

→ Volume of iron = 22/7 × 80 × 147

→ Volume of iron = 1760/7 × 147

→ Volume of iron = 258720/7

→ Volume of iron = 36960 cm³

Hence, the volume of the iron used in the roller is 36960 cm³.

the VALUE of X is -4

this is the RIGHT ANSWER

Answer:- Silver is a metal which is a good conductor of electricity.

Examples:- Gold , Copper , Aluminium and many more.

The USES of metals in our daily life:-

Aluminium

1. Aluminium is used for making cooking utensils, FOOD packing foil, etc.
2. Aluminium is used for making electrical transmission LINES for power distribution.

Copper

1. It is also used for making electrical transmission wires.
2. it is also used for making coils for electric motors, GENERATORS, etc.

Tungsten

1. Tungsten is a poor conductor of electricity but it is used as filaments in electric bulbs.
2. It is also mixed with steel to INCREASE its hardness and strength.

Gold and silver

1. They are used for making artificial teeth, filling teeth cavities.
2. Silver is also used for making electrodes.

Calcium

1. Calcium is the most abundant metal in the human body.
2. Chalk ( calcium carbonate ) is used as a pigment in material such as paints, etc.

Mercury

1. This is a metal which is used in thermometer, barometers.
2. Sphygmomanometers ( used for measuring blood pressure )

ANSWER:

3.16is the CORRECT answer UPTO two decimal places.

Step-by-step EXPLANATION:

Answer:

i dont know SIR sry PLS tell other to ANS other will ans u very easily

Answer:

TOTAL amount in a PURSE= 550

Let number of notes of 10 =x

The number of notes of 50= x-1

According to the condition,

x×10+(x−1)×50=550

⟹10x+50x−50=550

⟹60x=550+50=600

⟹x=10

50 RUPEES notes= 10-1= 9

Step-by-step explanation:

Please LIKE my answers 10 {or} how much is it useful to you

Answer:

10% reduction

Step-by-step EXPLANATION:

HOPE it HELPS

Step-by-step explanation:

7 CUBE = 7 X 7 X 7 = 343

MARK AS BRAINLIEST

ANSWER:

-4x³+5x²-6x-6 we have to ADD.

Answer:

-4/3

Step-by-step explanation:

standard FORM must ALWAYS be in its simplest form and DENOMINATOR must be positive

Answer:

3250 just TRY it WOLUD be

Answer:

1 WHOLE 3 UPON 4

Step-by-step explanation:

PLEASE mark me as brainiliest.

first u DRAW a line in that for 1cm u mark it and make it like 123456789......and make devide of CENTER and in right+ and LEFT- and mark it and make 1/2 2/2,3/2,4/2 and Star that ONE

Step-by-step explanation:

this is the answer

xacy is the BEST is to do

ANSWER:

the CORRECT answer is 16

ANSWER:

This implies that

x2+2ax=4x−4a−13

or

x2+2ax−4x+4a+13=0

or

x2+(2a−4)x+(4a+13)=0

Since the equation has just one solution INSTEAD of the usual two DISTINCT solutions, then the two solutions must be same i.e. discriminant = 0.

Hence we get that

(2a−4)2=4⋅1⋅(4a+13)

or

4a2−16a+16=16a+52

or

4a2−32a−36=0

or

a2−8a−9=0

or

(a−9)(a+1)=0

So the VALUES of a are −1 and 9.

by this formula you can FIND

ANSWER:

I HOPE this will HELP you

36

Answer:

kakakakkaoakk

Step-by-step EXPLANATION:

hshajjajJJsjnamamammamamM khud SOLVE KARO ya apne sir se KARA

Answer:

PLEASE WRITE full. QUESTION it's a incomplete question

ANSWER:

Step-by-step EXPLANATION:

PLEASE MARK me as a BRAINLIEST

ANSWER:

No. of kms Hari runs in a HOUR= 12km

No. of kms Hari runs in 2 HOURS= 12 x 2=24km

Speed= DISTANCE/ Time

Speed= 270/30

Speed= 9m/s

ANSWER:

-14X

Step-by-step EXPLANATION:

(2-7x)-(7x-2)

=2-7x-7x-2

= -14x

All the sides of the quadrilateral are equal. hence the quadrilateral is a rhombus.

Each side of the rhombus = 60 cm

Let ∠A=60

∘

Then, ∠C=∠A=60 (Opposite ANGLES)

and, ∠B=∠D=x

Sum of angles of rhombus = 360

∠A+∠B+∠C+∠D=360

2x=360−120

x=120

∘

∠B=∠D=120

∘

In △ABC

cosB=

2×AB×BC

AB

2

+BC

2

−AC

2

cos120=

2×60×60

60

2

+60

2

−AC

2

2

−1

=

2×60×60

60

2

+60

2

−AC

2

−60

2

=2×60

2

−AC

2

AC=60

3

AC=103.92 cm

In △ABD

∠A=60

∘

COSA=

2×AB×AD

AB

2

+AD

2

−BD

2

cos60=

2×60×60

60

2

+60

2

−BD

2

2

1

2×60×60

2×60

2

−BD

2

60

2

=2×60

2

−BD

2

BD=60 cm

ANSWER:

BREADTH is 30m

area 2100m SQ.

Answer:

PLEASE FOLLOW karo phir BATAUNGA

why she is CALLING you FAKE

SI= Rs(20000–16000)=Rs4000

Rate %=4000×100/16000×½=50%

PLEASE mark it as a BRAINLIST answer. ❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️

and follo W me

Step-by-step explanation:

2/5 × (3/5 - 2/8)

2/5 ×(24- 10/40)

2/5 ×(14/40)

2/5× 14/40

14/20 = 0.7

Step-by-step EXPLANATION:

follow.

me.

☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️☺️

(a). Googlopex

...................................

Answer:

AREA of BORDER = 64m²

Step-by-step explanation:

Length of inner rectangle = 20m

Breadth of inner rectangle = 10M

Area of inner rectangle = lb = 20m × 10m = 200m²

Length of outer rectangle = 20 + 2 = 22m

Breadth of outer rectangle = 10 + 2 = 12m

Area of outer rectangle = lb = 22m × 12m = 264m²

Area of border = Area of outer rectangle - Area of inner rectangle

Area of border = 264m² - 200m² = 64m².

Answer:

6 RATIONAL NUMBERS between=3/5&3/4

by the problem

3/5*4/4,3/4*5/5

12/20,15/20

multiply by 10

12/20*10/10,15/20*10/10

120/200,150/200

121/100,122/100,123/100,124/100,125/100,126/100

ANSWER:

THRE is no IMAGE given

Step-by-step EXPLANATION:

ANSWER:

-2/3

Step-by-step EXPLANATION:

...............

ওরাল রেহিদ্রেতেদ সলিউশন

Step-by-step EXPLANATION:

HOPE YOU UNDERSTAND IT

PLEASE MARK AS BRAINLIEST

ANSWER:

this is the factorisation

Step-by-step EXPLANATION:

(3X)2+(2)2+2(3x)(2)

= (3x+2)(3x+2)

Answer:

Let the width of the rectangle be X.

Length of rectangle = 3x

Perimeter of rectangle = 2(l+b)

=> 80 = 2(3x+x)

=> 40 = 4X

=> x = 40/4

=> x = 10

Hence, the width is 10 m and the length is 30 m.

Answer:

1) No

2) No

3) YES

ANSWER:

39 is the answer sisooo

what are you doing......

ANSWER:

k=-14/5.

Step-by-step explanation:

5x-7y-5=0. and 2x+ky-1=0.

a1/a2=5/2, b1/b2=-7/k, c1/c2=-5/-1=5.

a1/a2 not EQUAL to b1/b2 not equal to c1/c2.

5/2=-7/k.

5k=2×-7.

5k=-14.

k=-14/5.

Step-by-step EXPLANATION:

(y-9)^2

y^2 -(9)^2+2×9y

y^2- 81 +18Y

Answer:

73 days

Simple interest =

where P is the PRINCIPAL amount , R is the RATE and T is time.
1. P=4500,R=4,T=0.5
applying in formula, simple interest=Rs.90
2.1. P=12000,R=18,T=

applying in formula, simple interest=Rs.720
3.1. P=1000,R=10,T=0.2
applying in formula, simple interest=Rs.20

ANSWER:

9005/1000 is answer of QUESTION FOLLOW me and MARK as BRAINLIST answer

ANSWER:

But where is the FIGURE

Step-by-step EXPLANATION:

no I can't because I am having my EXAMS

Answer:

A number that cannot be expressed as a ratio between two integers and is not an imaginary number. If written in decimal NOTATION, an irrational numberwould have an infinite number of digits to the right of the decimal point, WITHOUT repetition. PI and the SQUARE root of 2 (√2) are irrational NUMBERS...

hope it's help you

mark as brainlist..