Explanation

• Official communication uses a formal tone.
• It is clear, respectful, and professional.

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Explanation

• After the salutation (e.g., Dear Sir/Madam), the body of the letter comes.
• The body contains the main message or content.

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Explanation

• A conjunction connects two clauses or ideas; here, "because" links the reason for running fast.
• It shows cause and effect between "He ran fast" and "he was late."

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Explanation

• “Difficult” is an adjective because it describes the noun “question.”
• Adjectives tell the quality or condition of a noun.

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Explanation

• “Hardly” is an adverb because it modifies the verb “works.”
• It shows the degree/frequency of the action.

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Explanation

a:b = 7:8

b:c = 4:5

Make b same:

a:b = 14:16

b:c = 16:20

Therefore, a:c = 14:20 = 7:10.

Last verified on 14-05-2026

Explanation

Mean = (5 + 7 + 9) ÷ 3

= 21 ÷ 3

= 7

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Explanation

• A chord that passes through the center of a circle is called a diameter.
• It is the longest chord of the circle.

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Explanation

Using trigonometric identity:

tan²θ + 1 = sec²θ

So, tan²θ + 1 = sec²θ.

Last verified on 14-05-2026

Explanation

Given cosθ = 5/13

sinθ = √(1 − 25/169)

= √(144/169)

= 12/13

Last verified on 14-05-2026