Explanation

Work = Persons × Days = 3 × 4 = 12 person-days

With 4 persons: 12 ÷ 4 = 3 days.

Explanation

a² - b² = (a - b)(a + b).

Explanation

"Before entering" is the correct phrase, indicating the action should happen prior to entering.

It properly links with the verb "ask permission" to show timing and respect.

Explanation

فتور اُٹھانا کا مطلب ہوتا ہے فساد یا ہنگامہ برپا کرنا۔

یہ محاورہ ایسی صورتِ حال کے لیے بولا جاتا ہے جب کوئی غیر ضروری شور، فساد یا خلل پیدا کرے۔

Explanation

The Entity Relationship (ER) Model visually represents entities, their attributes, and relationships in a database.

It is widely used in database design to define the logical structure before actual implementation.

Explanation

Explanation

Effective teachers treat all students not equally.

Because every student has a unique learning style, background, and set of needs, effective teachers recognize these differences and respond to them appropriately.

Explanation

Assessment helps the teacher gauge a child's understanding, interest, and attention informally or formally.

It includes activities like quizzes, observations, and discussions to improve learning.

Explanation

"Through the tunnel" means entering at one end and coming out the other.

It accurately describes movement inside a passage like a tunnel.

Explanation

Let's simplify the expression:

√3 × √5 × √15

= √(3 × 5 × 15)

= √(225)

= 15