Explanation

The sum of the first n natural numbers can be calculated using the formula:

n(n + 1)/2

Here, n = 200:

Sum = 200(200 + 1)/2

= 200 * 201 / 2

= 20100

Explanation

Homonyms are words that have the same spelling and pronunciation but different meanings (e.g., "bat" - an animal and "bat" - used in sports).

They often cause confusion without context due to their identical form.

Explanation

In volleyball, the playing area is called a "court".

A standard volleyball court measures 18 meters long and 9 meters wide.

Explanation

Reflexive pronouns refer back to the subject (e.g., I saw myself).

Words like myself, yourself, himself, herself, itself, ourselves, yourselves, themselves are reflexive pronouns.

Explanation

"Assessment of learning" is used to evaluate student performance by comparing it with learning goals and standards.

It is typically summative and helps in making final judgments about achievement.

Explanation

غزوہ حنین کے موقع پر مالک بن عوف، جو قبیلہ ہوازن کا سردار تھا، شکست کے بعد اپنے کچھ سپاہیوں کو لے کر قلعہ طائف میں جا چھپا۔

اس نے وہاں پناہ لی اور مسلمانوں کے خلاف مزید مزاحمت کی تیاری کی۔

Explanation

Given ratio:

Sand : Cement = 4.8 : 2

Let's find the factor by which 4.8 is multiplied to get 6 kg of sand:

6 kg / 4.8 = 1.25

Now, multiply the cement ratio by this factor:

Cement needed = 2 × 1.25

= 2.5 kg

Explanation

The discriminant (D) of a quadratic equation ax^2 + bx + c = 0 is given by:

D = b^2 - 4ac

Given:

a = 1, b = 9, c = 2

D = 9^2 - 4(1)(2)

= 81 - 8

= 73

Explanation

Pitch determines whether a sound is shrill (high-pitched) or grave (low-pitched).

It depends on the frequency of the sound waves — higher frequency means higher pitch.

Explanation

Andragogy refers to the method and practice of teaching adults.

It differs from pedagogy, which is focused on teaching children.