Explanation

The dielectric constant of water at around 18°C is approximately 80.

This high value makes water an excellent polar solvent for ionic and polar compounds.

Explanation

To find the fraction midway between 1/5 and 1/7, let's find their average:

Midpoint = ((1/5) + (1/7)) / 2

First, find the common denominator for 5 and 7, which is 35:

(1/5) = 7/35

(1/7) = 5/35

Now, find the average:

Midpoint = ((7/35) + (5/35)) / 2

= (12/35) / 2

= 12/70

= 6/35

Explanation

The final step of the scientific method is developing a conclusion.

It involves summarizing the findings, interpreting the data, and determining whether the hypothesis was supported or rejected.

The scientific method steps in order:

• Observation
• Hypothesis
• Prediction
• Research
• Experimentation
• Data Analysis
• Conclusion

Explanation

"I wasn't feeling well, so I decided not to go to university."

"So" is used to show cause and effect in a simple, natural way. 

"So" fits the informal tone of the sentence and is the most natural choice.

Explanation

The correct structure for present simple negative is: "do not + base verb" → do not care.

The idiom "not care a fig" means not care at all, and "do not care a fig" is its proper usage.

Explanation

Let's denote the number as x.

Given that 2/3 of x decreases its 4/5 by 8:

(2/3)x = (4/5)x - 8

To solve for x, let's multiply the entire equation by 15 (the least common multiple of 3 and 5) to eliminate the fractions:

10x = 12x - 120

Subtract 10x from both sides:

0 = 2x - 120

Add 120 to both sides:

120 = 2x

Divide both sides by 2:

x = 60

Explanation

"I write an essay" is a simple sentence

'I' is always a subject.

write is a verb

A simple sentence contains a subject and a verb and expresses a complete thought. 

Explanation

Explanation

The book "Why Nations Fail: The Origins of Power, Prosperity, and Poverty" (2012) is authored by:

Daron Acemoglu (MIT economist)

James A. Robinson (political scientist)

Nations fail or succeed based on inclusive vs. extractive institutions, not culture, geography, or ignorance.

Explanation

 "She is a nice girl." is a positive statement.

The auxiliary verb here is "is" (from "is a nice girl").

To form the tag question, we invert the auxiliary verb and add the corresponding pronoun.

Thus, the tag question is:

"She is a nice girl, isn't she?"

This structure follows the rule: positive statement + negative tag.

Therefore, the correct answer is:  Isn't she