Explanation

In a do-while loop, the body executes first, and the condition is checked afterward, ensuring it runs at least once.

This differs from for and while loops, which check the condition before executing.

Explanation

The set { 0, +, - } contains three distinct elements:

0, +, and −

Explanation

40% of 45 = (40 ÷ 100) × 45 = 18.

So, 18 is 40 percent of 45.

Explanation

"define" is a reserved keyword in C, used in preprocessor directives (e.g., #define) and cannot be used as a variable name.

Variable names like "address", "name", and "age" are valid as they follow C naming rules and aren't reserved.

Explanation

The Operating System (OS) keeps track of the location, names, and structure of all files stored on a computer.

It manages the file system, ensuring users and programs can access and organize data efficiently.

Explanation

A band is the correct collective noun for a group of musicians.

"Team" is used for sports players.

"Group" is general.

Explanation

In the word "island", the letter S is silent — it is not pronounced when speaking.

The pronunciation is /ˈaɪ.lənd/, where "S" is not heard.

Explanation

First, find the rate at which the carpenters work:

6 carpenters make 8 chairs in 10 days.

Step 1: Calculate the rate of work per carpenter per day

Rate = 8 chairs / (6 carpenters * 10 days)

= 8 / 60

= 4/30

= 2/15 chairs per carpenter per day

Step 2: Calculate the number of days for 10 carpenters to make 18 chairs

Let the number of days be x.

10 carpenters * x days * (2/15) chairs/carpenter/day = 18 chairs

(20/15)x = 18

(4/3)x = 18

x = 18 * (3/4)

x = 13.5

Explanation

Multiplying by 100 shifts the decimal 2 places to the right.

Example: 3.45 × 100 = 345.

Explanation

an = 5n − 7

This is an arithmetic sequence with first term a = -2 and common difference d = 5.

General formula: an = a + (n−1)d = -2 + (n−1)×5 = 5n − 7.