Explanation

The conjugate acid of water (H₂O) is H₃O⁺ (hydronium ion).

When water acts as a base, it accepts a proton (H⁺) and forms H₃O⁺.

Explanation

ATP (Adenosine Triphosphate) is called the energy currency of the cell because it stores and provides energy for cellular activities.

It releases energy when converted to ADP (Adenosine Diphosphate), which is then recycled back into ATP through cellular respiration.

Explanation

• A rubric is a scoring guide used to evaluate the quality of students' work, such as assignments, projects, and essays.
• It outlines specific criteria and standards for assessment, providing a clear and objective way to measure student performance.

Explanation

• The principal is the head of the school and holds the major responsibility for school management.
• They are responsible for overseeing the overall functioning of the school, including academic, administrative, and financial aspects.

Explanation

Explanation

To find the ratio of 1.8 to 2:

Divide 1.8 by 2:

1.8 ÷ 2 = 0.9

Now, multiply by 10 to eliminate the decimal:

0.9 × 10 = 9

The ratio becomes:

9 : 10

Explanation

The human hearing range is typically from 20 Hz to 20,000 Hz.

Sounds below 20 Hz are called infrasound.

Sounds above 20,000 Hz are called ultrasound, both of which are inaudible to humans.

Since 22,000 Hz is above 20,000 Hz, it is an inaudible sound.

Explanation

The given equation is:

5x - 10 = 35

Add 10 to both sides:

5x = 45

Divide by 5:

x = 9

Explanation

To solve for x:

x/2 + 1 = 15

Subtract 1 from both sides:

x/2 = 14

Multiply both sides by 2:

x = 28

Explanation

To find the Highest Common Factor (HCF) of 12, 18, and 30, we follow these steps:

Find the prime factors:

12 = 2 × 2 × 3

18 = 2 × 3 × 3

30 = 2 × 3 × 5

Identify common factors:

Common prime factors: 2 and 3

Multiply them: 2 × 3 = 6