Explanation

Light signals, such as semaphore flags or lantern flashes, were commonly used by sailors to communicate over distances.

These signals conveyed messages visually before the invention of modern communication tools.

Explanation

A transitive verb needs a direct object to complete its meaning.

In this sentence, "brought" is the transitive verb and "a gift" is its direct object.

Explanation

In volleyball, the playing area is called a "court".

A standard volleyball court measures 18 meters long and 9 meters wide.

Explanation

The additive inverse of a number is the value that, when added to the original number, results in zero.

For 1/7, the additive inverse is:

-1/7

Since:

1/7 + (-1/7) = 0

Explanation

Raffinose is a trisaccharide, composed of galactose, glucose, and fructose.

Lactose is a disaccharide.

Fructose is a monosaccharide.

Explanation

Long Horse is a vaulting apparatus used in gymnastics for performing jumps and flips.

It was historically used in men's artistic gymnastics but later replaced by the vaulting table.

Explanation

"Us" is a pronoun because it refers to a group of people.

It is the objective case of the pronoun "we."

Explanation

The correct sentence is:

"Many people think that education is necessary, not for women."

Here, "necessary" is the correct adjective to describe education.

Explanation

Given:

μ + v = 8

μv = 15

The formula for (μ - v)² is:

(μ - v)² = (μ + v)² - 4μv

= 8² - 4 × 15

= 64 - 60

= 4

μ - v = ±√4

μ - v = ±2

Explanation

The word "Bus" contains the short vowel sound /ʌ/ as in “cup”.

The other words have long vowel sounds:

Shoe (/uː/),

Car (/ɑː/),

Read (can be /riːd/ – long vowel).