Explanation

The given set:

{x|x ∈ N, 1 ≤ x < 4}

Can be read as:

The set of all natural numbers x such that 1 ≤ x < 4

This includes the numbers 1, 2, and 3, but excludes 4.

Explanation

1 is not a prime number because it has only one factor (1).

It’s also not composite because composite numbers have more than two factors.

Explanation

"Which is very old" is a relative clause because it provides additional information about the noun "house" in the main sentence.

A relative clause typically begins with a relative pronoun like "which," "who," or "that."

Explanation

The formula to find the arc length (I) is:

I = rθ

Given values:

I = 30 cm

r = 6 cm

Rearrange the formula to solve for θ:

θ = I / r

= 30 / 6

= 5 radians

Explanation

To find the profit percentage:

Profit = Sale Price - Cost Price

= 750 - 570

= 180

Profit Percentage = (Profit / Cost Price) × 100

= (180 / 570) × 100

= 0.31579 × 100

≈ 31.578%

Explanation

Chlorofluorocarbons (CFCs) are chemical compounds that contain fluorine, carbon, and chlorine.

They were commonly used in refrigeration and air conditioning but are now regulated due to their role in ozone depletion.

Explanation

In the sentence "His biggest fear is driving on the main road," the word "driving" is a gerund.

A gerund is the -ing form of a verb that functions as a noun.

Here, "driving" is acting as a noun.

It is the subject of the sentence.

Explanation

Neurons transmit messages through electrical impulses (action potentials) and chemical signals (neurotransmitters), forming an electrochemical wave.

These signals travel across the neurons and synapses to communicate information throughout the body.

Explanation

Seating arrangement plays a crucial role in instructional communication, as it can influence how an instructor engages with students and how students collaborate with each other.

For example, an arrangement that fosters group interaction may encourage better communication among students, while a more traditional, rows-facing arrangement may limit such interaction.

Explanation

A histogram is a type of vertical bar graph used to represent frequency distributions, where the bars touch each other to indicate continuous data.

Unlike bar graphs, histograms do not have space between the bars, reflecting intervals of data.