Explanation

Vertical angles are equal, so set up an equation:

80° = 4x

Divide both sides by 4:

x = 80° / 4

x = 20°

Explanation

Somebody is an indefinite pronoun because it refers to an unspecified person.

Indefinite pronouns do not point to any specific individual.

Explanation

Linking verbs do not express action; instead, they connect the subject to additional information, such as a state or condition.

Examples include is, am, are, was, were, seem, become, which link the subject to a complement (e.g., "She is happy.").

Explanation

• When red litmus paper is dipped in a basic solution, it turns blue.
• This indicates that the solution is basic, or alkaline.

Note: When blue litmus paper is dipped in an acid solution, it turns red.

Explanation

Skimming is reading rapidly in order to get a general overview of the material.

Scanning is reading rapidly in order to find specific facts.

Explanation

• The speed of sound in air at 0°C (32°F) is 332 meters per second.

The speed of sound in different materials:

• Air: 332 m/s
• Sea water: 1530 m/s
• Lead: 2160 m/s
• Gold: 3240 m/s
• Brick: 3650 m/s
• Copper: 4760 m/s
• Glass: 5100 m/s
• Aluminium: 6420 m/s

Explanation

• In plants, water and minerals are transported from the roots to the leaves through the xylem.
• A type of vascular tissue.

Explanation

• Insects like bees, butterflies, moths, and beetles are important pollinators of plants in gardens.
• They visit flowers to collect nectar and pollen, and in the process, transfer pollen from one flower to another, allowing for fertilization to occur.

Explanation

Conversion of binary (101011) to decimal:

Write the binary digits with powers of 2:

1×2⁵ + 0×2⁴ + 1×2³ + 0×2² + 1×2¹ + 1×2⁰

= 32 + 0 + 8 + 0 + 2 + 1

= 43

So, binary (101011) = decimal 43.

Explanation

• Small pieces of DNA are called plasmids.
• Plasmids are circular, double-stranded DNA molecules that are separate from the chromosomal DNA.
• It can replicate independently, commonly found in bacteria.