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3 years ago

5 men take 45hours to build a wall.how long will it take 9men working at the same wall?

Mathematics

1 answer:

Karolina [17]3 years ago

7 0

Answer:

25 hours

Step-by-step explanation:

It takes 5 men 45 hours to build a wall.

So, if no. of men increases by 1.8 [∴ 5 x 1.8 = 9],

then time taken reduces by that same amount.

=> 45 hours / 1.8

=> 45 / (9/5)

=> 45 x 5 / 9

=> 5 x 5

=> 25 hours

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A circle has a radius of 3.88 inches. Using the correct number of significant digits, find the circumference and area of the cir

tangare [24]

Answer:

The circumference of the circle is 24.37 in

The area of the circle is 47.27 in²

Step-by-step explanation:

The circumference of a circle is given by the formula

$C = 2\pi r\\$

Where $C$ is the circumference of the circle

$\pi$ is a constant (Take $\pi$ = 3.14)

and $r$ is the radius of the circle

From the question,

radius, $r$ = 3.88 in

Hence, the circumference, $C$ becomes

$C = 2\pi r\\$

$C = 2(3.14)(3.88)\\$

$C = 24.37$ in

Hence, the circumference of the circle is 24.37 in

For the area of the circle,

Area of a circle is given by

$A = \pi r^{2}$

Where $A$ is the area of the circle

Since, radius, $r$ = 3.88 in

The area of the circle then becomes

$A = \pi r^{2}$

$A = (3.14) (3.88)^{2}$

$A = 47. 27$ in²

Hence, the area of the circle is 47.27 in²

7 0

4 years ago

Solve the system by substitution. 2x + 3y = 32 y = x + 9

HACTEHA [7]

Answer:

x=1 and y=10 (1,10)

Step-by-step explanation:

2+30=32

10=1+9

3 0

3 years ago

PLEASE HELP NO... NO NONSENSE PLZZZ

hodyreva [135]

Answer:

So, basically they want the answers of the problems?

Step-by-step explanation:

1. seven feet is below 4 1/2 feet below sea level

2. sixteen is higher then zero

3. three feet is less then five and a half

4. loosing $500 dollars is worse then gaining $200

5. 64 is worse then a 65

6. 13.2 is more then both November and October combined

6 0

3 years ago

Read 2 more answers

Guys pls help me in this coz im very confused in this

NARA [144]

Answer:

Step-by-step explanation:

1. Copy the diagram using ruler for parallel lines * ensure they (the parallel lines) each have the same distance each point to one another before drawing or adding the transversal line L(3)

The transversal doesn't have to be exact to the diagram but the parallel lines do have to be correct to prove that angle 1 + 5 are identical and fit into each other.

2. They only become corresponding because of being on transversal to add to 180 degree. As you will see when you draw angle 1 on colored paper near the first blue/green circle and match with 5 below in the second blue/green circle.

3. The reason they want tracing paper afterwards of the same shape is so you can use alternatively to cover angle 5 in your book.

You will see they do cover each other.

Additional

''When two lines are crossed by another line (which is called the Transversal), the angles in matching corners are called corresponding angles. ''

Should you enter search for the above statement it will show you an interactive tool you can use for regarding maths transversal.

Here you can compare parallel lines like l(1) and l(2) as even if they were not parallel they would still be corresponding angles. As you will see.

5 0

3 years ago

Read 2 more answers

Help please !~ I’ll give brainliest! Any help is appreciated :)

jeka94

In most approximate way it can never be the area of the circle (Accurate area)

This is why because after creating base lines of each triangle it forms an inscribed polygon .

Some little spaces left over each side or b_n

h is already approaching to r

and b_1+b_2..b_n is approaching to the perimeter i.e 2πr

Option B

5 0

2 years ago

5 men take 45hours to build a wall.how long will it take 9men working at the same wall?​

5 men take 45hours to build a wall.how long will it take 9men working at the same wall?