Convert the decimal number 18 into its binary equivalent. What is the decimal equivalent of the binary number 1010? List three formatting features available in a word processor like Microsoft Word. Define the term Phishing. State two measures you can take to ensure online safety.

$$1 \div 2 = 0 \text{ remainder } 1$$

Reading the remainders from bottom to top gives the binary equivalent.
Binary: $\boxed{\text{10010}_2}$

b) To convert the binary number $10101_2$ into its decimal equivalent:

$$16 + 0 + 4 + 0 + 1 = 21$$

Decimal: $\boxed{21_{10}}$

Item 4
Three formatting features available in a word processor like Microsoft Word are:

• i) Changing font style, size, or color.
• ii) Applying bold, italic, or underline effects to text.
• iii) Adjusting text alignment (e.g., left, center, right, justify).

Item 5

a) Phishing is a type of cyberattack where malicious actors attempt to deceive individuals into revealing sensitive information, such as usernames, passwords, or credit card details, by impersonating a trustworthy entity in electronic communications like emails or messages.

b) Two measures you can take to ensure online safety are:

• i) Using strong, unique passwords for different online accounts and enabling two-factor authentication (2FA) whenever possible.
• ii) Being cautious of suspicious links or attachments in emails and messages, and verifying the sender's identity before clicking or downloading anything.