Explanation

There are n cows: 
First son gets: 2n​

Second son gets: 4n​

Third son gets: 5n​

Fourth son gets: 7 cows

Therefore, sum of cows each son gets equals the total number of cows
2n​+4n​+5n​+7=n
7=20n​
n=140

Explanation

47 × 47 = 2209

Clearly, 6 should be added to 2203 to get a perfect square.

Explanation

Bioenergetics is the branch of biochemistry that focuses on how cells transform energy, often by producing, storing or consuming adenosine triphosphate (ATP).

Bioenergetic processes, such as cellular respiration or photosynthesis, are essential to most aspects of cellular metabolism, therefore to life itself.

Explanation

The zeroth law of thermodynamics states that if two thermodynamic system are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Explanation

Vitamin B12 is a nutrient that helps keep the body's nerve and blood cells healthy and helps make DNA, the genetic material in all cells. Vitamin B12 also helps prevent a type of anemia called Megaloblastic Anemia that makes people tired and weak 

Explanation

"The branch of science concerned with the nature and properties of matter and energy.

The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

Explanation

X/Y = 3/2 So X = 3Y/2

(X^2 + Y^2)/(X^2 - Y^2)

Now replace the X value from first equation

= [ (3Y/2)^2 + Y^2] / [ ((3Y/2)^2 - Y^2]

= [ (9Y^2/4) + Y^2] / [ (9Y^2/4) - Y^2]

= [ (9Y^2 + 4Y^2)/4] / [ (9Y^2 - 4Y^2)/4]

= (9Y^2 + 4Y^2) / (9Y^2 - 4Y^2)

= 13Y^2 / 5Y^2

= 13/5

Explanation

reticent

لچکدار

Explanation

Because pollution control measures are expensive, many industries hesitate to adopt them.

Explanation

15+5+0+12+8/5

=40/5

=8