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

A rational number is defined as a number that can be expressed as the ratio of two integers, i.e., a/b, where a and b are integers and b ≠ 0.

Every rational number can be written in the form of a fraction, where the numerator and denominator are integers.

Example: 3/4, 22/7, 1/2, etc.

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

Cutlery means دھار دار یا کاٹنے کے اوزار

Explanation

Let's evaluate each statement:

1. -5 + 1 = -4 (not 4), so this statement is false.

2. 4 - 5 = -1 (true)

3. 2 + (-1) = 1 (true)

4. -7 + (-6) = -13 (true)

Explanation

A Speaker is an audio output device and cannot produce hard copies (physical prints).

Devices like printers, impact printers, and plotters are used to generate hard copy outputs.

Explanation

Abundance means کثرت

Plenty means کافی

Explanation

Distraction means خلفشار

Explanation

2483 × 253 = 628199 is the exact product.

This is a simple multiplication of two whole numbers.