Explanation

Set A is a subset of B because all elements of A are present in B.

Symbol ⊂ means "is a subset of".

Explanation

Natural numbers are counting numbers starting from 1, 2, 3, 4...

Explanation

5/2 is a real number (a rational number), as it can be written as a finite decimal (2.5).

Explanation

A number is exactly divisible by 5 if it ends in 0 or 5.

230590 ends in 0, so it is divisible by 5.

Explanation

The symbol ∩ represents the common elements between two or more sets.

For example, if A = {1, 2, 3} and B = {2, 3, 4}, then A ∩ B = {2, 3}.

Explanation

The prefix "dis-" means opposite of or not, and when added to "agreement", it becomes "disagreement".

"Disagreement" means a lack of agreement or conflict in opinion.

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

The subject is the person or thing doing the action — here, Raju is performing the action "went back".

So, Raju is the correct subject of the sentence.

Explanation

"Goes" is the present simple tense of the verb "go".

It describes a habitual or regular action happening in the present.

Explanation

The subject of a sentence is the doer of the action.

In this sentence, "teacher" is the one who teaches, so it's the subject.

Subject: The teacher

Verb: teaches

Object/Complement: in the class