Explanation

The given equation (a + b) + c = a + (b + c) is the standard form of the Associative Property of Addition.

It states that the grouping of numbers in an addition operation does not change the sum.

Explanation

Fertilization in frogs involves the fusion of male and female gametes — a clear example of sexual reproduction.

The budding, fission, vegetative propagation are all forms of asexual reproduction.

Explanation

The associative property of the union states that:

A ∪ (B ∪ C) = (A ∪ B) ∪ C

This means that the order in which we perform the union operation does not change the result.

Explanation

A cyclic quadrilateral is a four-sided figure where all vertices lie on the circumference of a single circle.

Key property: Opposite angles sum to 180°.

Explanation

Combined rate = 1/6; first pipe rate = 1/10.

Second pipe rate = 1/6 - 1/10 = 1/15.

So, the second pipe alone fills in 15 hours.

Explanation

Grieve means گہری غم کو محسوس کرنے یا اظہار کرنے کے لئے

Mourn means سوگ

Explanation

Liquids have smaller intermolecular spaces compared to gases, allowing particles to be more tightly packed.

This closeness results in a higher density in liquids than in gases.

Explanation

He asked if I was going.

This is an indirect question, so it ends with a full stop, not a question mark or colon.

No comma is needed after "asked" in indirect speech.

Explanation

"Kindment" is not a correct English word.

The correct word should be "kindness" — the sentence should read:

"We should treat the young and old with kindness."

Explanation

Continents and Number of Countries:

1. Africa: 54
2. Asia: 49
3. Europe: 44
4. North America: 23
5. Oceania (Australia): 16
6. South America: 12
7. Antarctica: 0 (No countries)